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1 *usr_26.txt* For Vim version 8.1. Last change: 2006 Apr 24
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3 VIM USER MANUAL - by Bram Moolenaar
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4
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5 Repeating
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6
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7
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8 An editing task is hardly ever unstructured. A change often needs to be made
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9 several times. In this chapter a number of useful ways to repeat a change
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10 will be explained.
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11
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12 |26.1| Repeating with Visual mode
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13 |26.2| Add and subtract
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14 |26.3| Making a change in many files
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15 |26.4| Using Vim from a shell script
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16
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17 Next chapter: |usr_27.txt| Search commands and patterns
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18 Previous chapter: |usr_25.txt| Editing formatted text
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19 Table of contents: |usr_toc.txt|
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20
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21 ==============================================================================
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22 *26.1* Repeating with Visual mode
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23
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24 Visual mode is very handy for making a change in any sequence of lines. You
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25 can see the highlighted text, thus you can check if the correct lines are
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26 changed. But making the selection takes some typing. The "gv" command
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27 selects the same area again. This allows you to do another operation on the
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28 same text.
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29 Suppose you have some lines where you want to change "2001" to "2002" and
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30 "2000" to "2001":
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31
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32 The financial results for 2001 are better ~
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33 than for 2000. The income increased by 50%, ~
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34 even though 2001 had more rain than 2000. ~
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35 2000 2001 ~
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36 income 45,403 66,234 ~
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37
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38 First change "2001" to "2002". Select the lines in Visual mode, and use: >
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39
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40 :s/2001/2002/g
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41
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42 Now use "gv" to reselect the same text. It doesn't matter where the cursor
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43 is. Then use ":s/2000/2001/g" to make the second change.
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44 Obviously, you can repeat these changes several times.
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45
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46 ==============================================================================
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47 *26.2* Add and subtract
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48
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49 When repeating the change of one number into another, you often have a fixed
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50 offset. In the example above, one was added to each year. Instead of typing
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51 a substitute command for each year that appears, the CTRL-A command can be
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52 used.
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53 Using the same text as above, search for a year: >
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54
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55 /19[0-9][0-9]\|20[0-9][0-9]
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56
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57 Now press CTRL-A. The year will be increased by one:
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58
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59 The financial results for 2002 are better ~
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60 than for 2000. The income increased by 50%, ~
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61 even though 2001 had more rain than 2000. ~
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62 2000 2001 ~
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63 income 45,403 66,234 ~
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64
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65 Use "n" to find the next year, and press "." to repeat the CTRL-A ("." is a
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66 bit quicker to type). Repeat "n" and "." for all years that appear.
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67 Hint: set the 'hlsearch' option to see the matches you are going to change,
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68 then you can look ahead and do it faster.
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69
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70 Adding more than one can be done by prepending the number to CTRL-A. Suppose
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71 you have this list:
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72
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73 1. item four ~
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74 2. item five ~
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75 3. item six ~
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76
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77 Move the cursor to "1." and type: >
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78
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79 3 CTRL-A
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80
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81 The "1." will change to "4.". Again, you can use "." to repeat this on the
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82 other numbers.
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83
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84 Another example:
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85
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86 006 foo bar ~
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87 007 foo bar ~
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88
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89 Using CTRL-A on these numbers results in:
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90
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91 007 foo bar ~
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92 010 foo bar ~
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93
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94 7 plus one is 10? What happened here is that Vim recognized "007" as an octal
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95 number, because there is a leading zero. This notation is often used in C
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96 programs. If you do not want a number with leading zeros to be handled as
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97 octal, use this: >
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98
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99 :set nrformats-=octal
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100
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101 The CTRL-X command does subtraction in a similar way.
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102
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103 ==============================================================================
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104 *26.3* Making a change in many files
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105
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106 Suppose you have a variable called "x_cnt" and you want to change it to
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107 "x_counter". This variable is used in several of your C files. You need to
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108 change it in all files. This is how you do it.
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109 Put all the relevant files in the argument list: >
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110
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111 :args *.c
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112 <
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113 This finds all C files and edits the first one. Now you can perform a
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114 substitution command on all these files: >
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115
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116 :argdo %s/\<x_cnt\>/x_counter/ge | update
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117
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118 The ":argdo" command takes an argument that is another command. That command
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119 will be executed on all files in the argument list.
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120 The "%s" substitute command that follows works on all lines. It finds the
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121 word "x_cnt" with "\<x_cnt\>". The "\<" and "\>" are used to match the whole
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122 word only, and not "px_cnt" or "x_cnt2".
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123 The flags for the substitute command include "g" to replace all occurrences
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124 of "x_cnt" in the same line. The "e" flag is used to avoid an error message
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125 when "x_cnt" does not appear in the file. Otherwise ":argdo" would abort on
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126 the first file where "x_cnt" was not found.
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127 The "|" separates two commands. The following "update" command writes the
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128 file only if it was changed. If no "x_cnt" was changed to "x_counter" nothing
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129 happens.
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130
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131 There is also the ":windo" command, which executes its argument in all
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132 windows. And ":bufdo" executes its argument on all buffers. Be careful with
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133 this, because you might have more files in the buffer list than you think.
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134 Check this with the ":buffers" command (or ":ls").
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135
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136 ==============================================================================
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137 *26.4* Using Vim from a shell script
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138
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139 Suppose you have a lot of files in which you need to change the string
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140 "-person-" to "Jones" and then print it. How do you do that? One way is to
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141 do a lot of typing. The other is to write a shell script to do the work.
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142 The Vim editor does a superb job as a screen-oriented editor when using
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143 Normal mode commands. For batch processing, however, Normal mode commands do
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144 not result in clear, commented command files; so here you will use Ex mode
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145 instead. This mode gives you a nice command-line interface that makes it easy
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146 to put into a batch file. ("Ex command" is just another name for a
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147 command-line (:) command.)
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148 The Ex mode commands you need are as follows: >
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149
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150 %s/-person-/Jones/g
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151 write tempfile
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152 quit
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153
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154 You put these commands in the file "change.vim". Now to run the editor in
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155 batch mode, use this shell script: >
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156
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157 for file in *.txt; do
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158 vim -e -s $file < change.vim
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159 lpr -r tempfile
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160 done
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161
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162 The for-done loop is a shell construct to repeat the two lines in between,
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163 while the $file variable is set to a different file name each time.
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164 The second line runs the Vim editor in Ex mode (-e argument) on the file
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165 $file and reads commands from the file "change.vim". The -s argument tells
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166 Vim to operate in silent mode. In other words, do not keep outputting the
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167 :prompt, or any other prompt for that matter.
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168 The "lpr -r tempfile" command prints the resulting "tempfile" and deletes
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169 it (that's what the -r argument does).
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170
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171
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172 READING FROM STDIN
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173
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174 Vim can read text on standard input. Since the normal way is to read commands
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175 there, you must tell Vim to read text instead. This is done by passing the
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176 "-" argument in place of a file. Example: >
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177
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178 ls | vim -
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179
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180 This allows you to edit the output of the "ls" command, without first saving
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181 the text in a file.
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182 If you use the standard input to read text from, you can use the "-S"
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183 argument to read a script: >
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184
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185 producer | vim -S change.vim -
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186
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187
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188 NORMAL MODE SCRIPTS
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189
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190 If you really want to use Normal mode commands in a script, you can use it
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191 like this: >
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192
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193 vim -s script file.txt ...
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194 <
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195 Note:
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196 "-s" has a different meaning when it is used without "-e". Here it
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197 means to source the "script" as Normal mode commands. When used with
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198 "-e" it means to be silent, and doesn't use the next argument as a
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199 file name.
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200
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201 The commands in "script" are executed like you typed them. Don't forget that
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202 a line break is interpreted as pressing <Enter>. In Normal mode that moves
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203 the cursor to the next line.
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204 To create the script you can edit the script file and type the commands.
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205 You need to imagine what the result would be, which can be a bit difficult.
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206 Another way is to record the commands while you perform them manually. This
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207 is how you do that: >
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208
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209 vim -w script file.txt ...
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210
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211 All typed keys will be written to "script". If you make a small mistake you
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212 can just continue and remember to edit the script later.
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213 The "-w" argument appends to an existing script. That is good when you
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214 want to record the script bit by bit. If you want to start from scratch and
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215 start all over, use the "-W" argument. It overwrites any existing file.
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216
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217 ==============================================================================
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218
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219 Next chapter: |usr_27.txt| Search commands and patterns
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220
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221 Copyright: see |manual-copyright| vim:tw=78:ts=8:noet:ft=help:norl:
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