Bash Programming Cheat Sheet (Page 3 of 4) in pdf

Bash Programming Cheat Sheet Page 3

Bash Programming Cheat Sheet

Page 3 of 4

Logic Con't.

If...then

if [ expression ]

then

commands

If..then...else

if [ expression ]

then

commands

else

commands

If..then...else If...else

if [ expression ]

then

commands

elif [ expression2 ]

then

commands

else

commands

Case select

case string1 in

str1)

commands;;

str2)

commands;;

esac

string1 is compared to str1 and str2. If one of these strings matches string1, the commands up until the double

semicolon (; ;) are executed. If neither str1 nor str2 matches string1, the commands associated with the asterisk are

executed. This is the default case condition because the asterisk matches all strings.

Iteration (Loops)

for var1 in list

commands

done

This executes once for each item in the list. This list can be a variable that contains several words separated by spaces

(such as output from ls or cat), or it can be a list of values that is typed directly into the statement. Each time through

the loop, the variable var1 is assigned the current item in the list, until the last one is reached.

while [ expression ]

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Bash Programming Cheat Sheet Page 3