Remove lines that contain a specific pattern($1) from file($2).

sed -i '/myexpression/d' /path/to/file.txt
The -i option in sed allows in-place editing of the input file. Replace myexpression with any regular expression. /expr/d syntax means if the expression matches then delete the line. You can reverse the functionality to keep matching lines only by using: sed -i -n '/myexpression/p' /path/to/file.txt

11
By: jgc
2009-11-09 11:40:45

What Others Think

The -i option to sed is not standard; most versions do not have it.
cfajohnson · 599 weeks and 2 days ago
for big files, try not using "d", but just "p" (print)
unixmonkey7109 · 599 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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