Command line stuff
A cheatsheet by @rstacruz|Refreshed 7 months ago.Refresh|View source on Github
ls [options] [paths]

Format

Format

Switch Description
-1 One entry per line
-l Long view
-o Long view (without groups)
-C Multicolumn (sorted horizontally)
-x Multicolumn (sorted vertically)
-F Add / after directories
-G Color

Options

Options

-R Recurse
-a Include hidden (dotfiles)
-A Include hidden (but not . and ..)

Sorting

Sorting

Switch Description
-r reverse order
-S sort by size
-t sort by time modified
-u sort by time accessed
-U sort by time created
-c sort by time status was changed
-h Human-readable size (3k)


tail [-F | -f | -r] [-bN | -cN | -nN] [file ...]

Modes

Modes

-f follow
-F follow by filename (accounts for log rotation)
-r Reverse order

Options

Options

-bN N*512 bytes
-cN N bytes
-nN N lines
+N Start from line N


sudo [options] <command>

Listing

Listing

-l List allowed commands

Options

Options

-A Use $SUDO_ASKPASS
-b Run in background
-E Preserve environment
-H use target’s $HOME
-n Don’t prompt for password
-P Preserve group vector
-S Read password from stdin

File descriptors

File descriptors

-C fd Close all open file descriptors

Prompt

Prompt

-p prompt Custom prompt (-p “%p password:”)

Interactive

Interactive

Switch Description
-i [cmd] Interactive shell without variables
-s [cmd] Interactive shell
-u user run as this user
-g group run as this group

Timestamp

Timestamp

-v revalidate timestamp for 5 mins
-k invalidate timestamp
-K just like -k


... | wc [options]
-c Bytes
-l Lines
-m Characters (incl multi-byte)
-w Words


perl -p -i -e 's/hello/HELLO/g' **/*


grep [options] [pattern] [file ...]

Options

Options

Switch Description
-A num Print num lines of training context
-G –basic-regexp (default)
-E –extended-regexp
-P –perl-regexp
-f file –file (Get patterns for file)
-F –fixed-strings
-h –no-filename
-H –with-filename
-l –files-with-matches (just print filenames)
-L –files-without-match
-r, -R –recursive
-v –invert-match
-i –ignore-case

Synonyms

Synonyms

egrep  =>  grep -E
fgrep  =>  grep -F