Invocations and commands
General, not macOS-specific or
Linux-specific.
I try to cover mostly standard commands here but sometimes the features of the invoking shell are also important.
You could optimise that also, e.g. by switching from
bash to fish or
PowerShell.
I suppose if I were a good person I’d check if any of the following commands are novel and submit them to
to tldr
or version my .cheats folder in my
dotfile repo,
or mention them in commandlinefu
but I’m now exhausted and just want to go home.
WTF
Return produces ^M instead of a newline?
Try:
stty sane^Jor possibly
stty icrnFor other miscellaneous screen garbage, maybe reset will help?
resetIt is more complicated if you made a mess in tmux.
As far as I am concerned this is all dark magic. If this nonsense wastes 2 hours of my life in total it will not justify the rather lengthier process of getting a better mental model of how terminals work.
File system watching
Watch That Filesystem, by
Al Williams, discusses how to trigger things based on filesystem events via
inotifywait and incron.
Thanks Yohans Bastian for pointing out this handy trick to find the PID of the process using the inotify watchers.
find /proc/*/fd \
-lname anon_inode:inotify \
-printf '%hinfo/%f\n' 2>/dev/null \
| xargs grep -c '^inotify' \
| sort -n -t: -k2 -rrebuild on change
entr watches for changed files and recompiles your whatsit when it gets edited. This is incredibly useful for automating life.
Which file is crashing/hanging $PID?
lsof -r -p $PID | grep /path/to/fileVars, expansions, file names, white space hell
See bash or fish depending on your choice of shell.
Or avoid both by using some other utility.
rename is a script
that makes renaming work how you imagine it should,
avoiding the mysterious punctuation stew at least somewhat.
rename -s html txt *.htmlNB depending on your distro you may get some other systutil rename which is much less powerful than the one I linked to, albeit still often powerful enough.
Text processing
Trailing whitespace
A shell script to remove trailing whitespace from a file -
put this in trimspace.sh:
#!/bin/bash
# macOS version
sed -i '' -e’s/[[:space:]]*$//' "$1"#!/bin/bash
# GNU version
sed -i -e’s/[ \t]*$//' "$1"Then you can trim trailing whitespace from your… whatever… by putting this line in there:
find . -type f -print0 | xargs -0 -I {} trimspace.sh \{\}Data wrangling
See text data processing.
Misc
rsync files in random order
based of Ole Tange’s tor version
Remotely
find . -maxdepth 4 -depth -type d | shuf | rsync --delete -zHax --inplace --rsync-path='mkdir -p {} && rsync' ~/{}/ remote.host:/some/dir/{}/Presumably this works locally:
for file in (find . -maxdepth 4 -depth -type d | shuf)
mkdir -p "$file" && rsync --delete -Hax --inplace - ./{}/ /some/dir/{}/
endDownload from command line without getting owned
curl --tlsv1.2 --proto=https --location \
--remote-name-all --remote-header-nameFind common diacritics in filenames
because of some kind of unicode strife
find . -iname "*[üñàáèéöäçã]*"Which process is bound to port $PORT?
lsof -nP -i4TCP:$PORT | grep LISTENSync only if drive present
test -d /Volumes/syncdrive/ && rsync --delete -avz \
192.168.0.1:/path/to/stuff/ /Volumes/syncdrive/Set operations
comm.
Meta command lines
Command lines to command your command lines.
Explainshell
Explainshell dissects a shell command and shows you the documentation for each part of it. Good for instilling this knowledge in your brain.
tldr
tldr:
New to the command-line world? Or just a little rusty? Or perhaps you can’t always remember the arguments to
lsof, ortar?
…And the manual for your typical command is utterly incomprehensible, so remembering is obviously preferable to trying to decipher it.
First
## install
npm install -g tldr
# or
brew install tldr
# invoke
tldr tarcheat
…allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of options for commands that they use frequently, but not frequently enough to remember.
## install
pip install cheat
# or
brew install cheat
# invoke
cheat tarhow do i
Are you a hack programmer? Do you find yourself constantly Googling for how to do basic programming tasks?
Suppose you want to know how to format a date in bash. Why open your browser and read through blogs (risking major distraction) when you can simply stay in the console and ask
howdoi
pip install howdoi
howdoi tarSeems to search the internet for you, and not be command-line specific, which is broader in scope than some of the other entrants here, but also noisier.
commandlinefu
commandlinefu has an awful command-line interface, but the website is so good that it makes the grade.
bash hackers wiki
bash hackers wiki: avoid its the paradigmatically awful bash manual
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