Unix tool tip
@UnixToolTip
Tips on Unix utilities and related topics from @JohnDCook.
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'The enjoyment of one's tools is an essential ingredient of successful work.' -- Donald E. Knuth
When giving numeric arguments to the find utility, + means greater than and - means less than. e.g. +7 means greater than 7.
In Emacs, to send the contents of a region to a shell command, use M-|.
"no Shakespeare yet -- only syntactically correct Bash scripts"
Legend has it gym memberships are particularly hard to cancel here because nobody knows how to exit
'With only s and d you should probably find a use for sed once a week.' -- @WilsonEricN
Replace string in a huge (70GB), one line, text file unix.stackexchange.com/questions/4136…
Trim leading and trailing whitespace: sed -i 's/^[ \t]*//;s/[ \t]*$//' somefile
Example from my latest blog post: sample a file with replacement, choosing 12 items: shuf -n 12 -r file.txt
Boolean operators in find: -not, -or. There's no 'and' because 'and' is implicit when two requirements are listed.
Seven habits of effective text editing moolenaar.net/habits.html // general principles, examples with Vim
Can show all environment variables with printenv. Probably want to pipe to less.
Repeat a shell command, replacing all instances of a word with something new johndcook.com/blog/2022/10/2…
'A successful software tool is one that was used to do something undreamed of by its author.' -- Stephen Johnson
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.
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Computer Science
@CompSciFact -
Regular Expression
@RegexTip -
Probability Fact
@ProbFact -
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Data Science Fact
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Scientific Python
@SciPyTip -
Analysis Fact
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Ubuntu
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The Linux Foundation
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nixCraft 🐧
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Topology Fact
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