Korn Shell: Unix and Linux Programming Manual, Third Edition, The

Control Commands

case value in

pattern1)	commands1;;
pattern2)	commands2;;
. . .
patternn)	commandsn;;

esac

Execute commands associated with the pattern that matches value.

for variable in word1 word2. . . wordn

do

commands

done

Execute commands once for each word, setting variable to successive words each time.

for variable

do

commands

done

Execute commands once for each positional parameter, setting variable to successive positional parameters each time.

if command1

then

commands

fi

Execute commands if command1 returns a zero exit status.

if command1

then

commands2

else

commands3

fi

Execute commands2 if commands1 returns a zero exit status, otherwise execute commands3.

if command1

then

commands

elif command2

then

commands

. . .

elif commandn

then ...