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How can I make a change to all files in a directory?

Last updated: 02/08/2012

Here's short csh script to loop through each file and add a line to it:

#!/bin/csh

foreach i (`ls *.txt`)
echo $i
echo "new line" | cat >> $i
end

This lists all *.txt files, and adds the line "new line" to each file. For more complicated edits, you should look at using sed or awk, but the foreach structure should still be helpful.

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How can I make a change to all files in a directory?