Command line stuff cheatsheet

List (ls)

ls [options] [paths]

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

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 ...]

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

sudo [options] <command>

`-l`	List allowed commands

-C fd Close all open file descriptors

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

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

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

... | wc [options]

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

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

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

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