118 lines
1.4 KiB
Plaintext
118 lines
1.4 KiB
Plaintext
= Bash =
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The shell itself
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== Common syntax ==
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I tend to forget it sometimes lol
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=== Brackets ===
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Remember '\[' is a program unto itself. Here are some common flags
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* -z
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- empty string
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* -n not
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- empty string
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* == aka -eq
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- equal
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* != aka -ne
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- not equal
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* -lt
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- less than
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* -gt
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- greater than
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* -ge
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- greater than or equal
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* !
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- not
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* &&
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- and
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* ||
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- or
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* -e
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- file exists
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* -r
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- is readable
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* -h
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- is symlink
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* -d
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- is directory
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* -s
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- has data in it
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* -f
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- is file
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* -x
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- is executable
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=== Variables ===
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{{{
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var=55
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echo $var
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}}}
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=== While ===
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{{{
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while [ condition ]; do
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echo "Hello world"
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done
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}}}
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=== Arays ===
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{{{
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Fruits={'Apple','Banana','Orange'}
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Fruits[0]="Apple"
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echo ${Fruits[0]}
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declare -A sounds
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sounds[dog]="bark"
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sounds[cow]="moo"
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sounds[bird]="tweet"
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sounds[wolf]="howl"
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echo ${sounds[dog]} # Dog's sound
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echo ${sounds[@]} # All values
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echo ${!sounds[@]} # All keys
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echo ${#sounds[@]} # Number of elements
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unset sounds[dog] # Delete dog
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}}}
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=== Math ===
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{{{
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$((a + 200)) #add 200 to a
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}}}
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=== Strings ===
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{{{
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${FOO%suffix} #remove suffix from foo
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${FOO#prefix} #remove prefix from foo
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${FOO/from/to} #replace first instance of from with to
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${FOO//from/to} #replace all instances of from with to
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${#FOO} #length of foo
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}}}
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== Common tasks ==
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Rename push all .png files through convert
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{{{
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for file in *.png; do
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convert $file "${file%.png}.eps"
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done
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}}}
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[[index]]
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