ASIC/FPGA Design and Verification Out Source Services

Global file search for text string replace

How to search for files and per each file do a global search of a given text string.

1. First do a "find command":

   find -type f //all files
   find -mtime -2 //two days old
   find . -name "*.c" //all c source files
   

2. Than prepare a little bash file including sed command:

#!/bin/bash
sed -e 's/timescale *.SV_TIMESCALE//' $1 > Tmp
\mv -f Tmp $1


3. It is possible to create a sed command with multiple replace strings:



sed -e 's/erors/errors/g' -e 's/last/final/g' my_file.txt > Tmp

4. To run it just fire up this command:

find . -name "*.v" | xargs -n1 | xargs -i= ./tiRm.unx =
where tiRm.unx is the name of the bash file.

5. Sometimes only one file is involved. In this case vim can be used to do the conditional replace operation.
   :g/0b/s/\([01]\) \(([01]\)/\1\2/g
   This will remove space between binary [01], if it finds the binary symbol 0b
   Another example is to replace some annoying ^M, which sometimes appear, when importing files from DOS to unix.
   :g/ctrlVctrlM/s///g


6. vim replace on blocks:
   You can use line numbers or vim marks to define a replace zone area.
   12,23g/polarity_cnt/s//polarity_cnt_dbg/g
   'a,'b g/polarity_cnt/s//polarity_cnt_dbg/g
   where the block is defined by the vim commands ma and mb.
   To run a script on a block from vim go to : perl script on run on block form within vim
   


7. Or do it from the command line using perl to do the job of string replace:
   perl -i -pe 's/00/99/;' Italian_top_100.txt


8. The following script may be helpful, should you need to replace a string in many files:

#!/bin/bash

sed -e 's/replcae me/with this/' $1 > Tmp
#remove empty lines
#sed '/^ *$/d' $1 > Tmp
\mv -f Tmp $1

Note the the script is extremely simple. But its operation is a bit complex:
find . -name "*.c" | xargs -n1 | xargs -i= replace_with_sed_script.unx =

9. A similar issue is discussed at: search into multiple files and generate a report The solution in this page uses a for f (similar to perl's foreach statement) and therefore results in a simpler script.

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Home	A very simple perl script, to be run from within vim, to put an incremental value in binary format.