Unix tool tip @UnixToolTip
Tips on Unix utilities and related topics from @JohnDCook. JohnDCook.com Joined August 2011-
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'A successful software tool is one that was used to do something undreamed of by its author.' -- Stephen Johnson
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Limit find's depth of search with the -maxdepth option.
If you only want to know whether two files differ, not how they differ, use diff -q (or --brief).
Awk can use a pair of regular expressions as a range, just like sed. In both languages, /foo/,/bar/ matches the same lines.
Count the number of lines matching regex in each file: grep -c
Over 100 sed one-liners pement.org/sed/sed1line.t…
Print only the lines that are 65 characters in length or longer: awk 'length > 64'
You can make a passable Perl REPL by combining the Perl debugger with rlwrap: rlwrap perl -de1
Command option patterns johndcook.com/blog/2011/05/1…
Split a binary file into megabyte chucks: split -b1m binaryfile
Have you ever wished your bash script could print out a snake, a flying saucer, or a nose? Of course you have. Who hasn't? Well, now you can. These symbols have been included in Unicode 17.0.
Using sed to make indexes for books pement.org/sed/make_index…
List lines that do NOT match a regular expression: grep -v
Editing by semantic units johndcook.com/blog/2012/07/2…
Remove duplicate lines: awk '!a[$0]++' from catonmat.net/blog/awk-book/
The day Return became Enter aresluna.org/the-day-return…
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