Unix tool tip @UnixToolTip
Tips on Unix utilities and related topics from @JohnDCook. JohnDCook.com Joined August 2011-
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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…
Gnu Emacs reference card damtp.cam.ac.uk/user/sje30/ess… [pdf]
The sed command r inserts a file. For example, insert foo.h after 'INCLUDE': sed '/INCLUDE/ r foo.h'
The option -i or --ignore-case tells diff to do a case-insensitive comparison.
List files containing a match for a regular expression: grep -l
The substitute command in sed can take a 'w' option to specify an output file. e.g. sed s/foo/bar/w myfile.
Negative space in operating systems johndcook.com/blog/2008/12/2…
“I use Emacs, which might be thought of as a thermonuclear word processor.” — Neal Stephenson
Awk script to count the number of words in a file: awk '{ total = total + NF }; END { print total+0 }'
wc -L shows the length of the longest line in a file.
wc returns the number of lines, words, and bytes in a file. Can use -l, -w, -c to get just one of these.
Comparing similar operations in sed and awk pement.org/awk/awk_sed.txt
Find is a beautiful tool: eriwen.com/productivity/f…
'The vim learning curve is a myth.' robots.thoughtbot.com/the-vim-learni…
One way to practice sed commands is to pipe echo out. Example: echo 'hello world' | sed s/world/orb/
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