KSH for Syntax

in Categories , , , , , last updated August 31, 2009

Can you explains UNIX ksh for loop syntax which can repeatedly execute a block of statements with a simple ksh script example?

UNIX ksh syntax is as follows:

for var in item1 item2 item3 ... itemN
do
      command1
      command2
      ...
      commandN
done

Here is a sample example:

#!/usr/bin/ksh
for character in  Tom Jerry Spike Tyke  Butch Tuffy  Quacker 
   do
   print "Tom and Jerry character is: $character"
done

Sample Outputs:

Tom and Jerry character is: Tom
Tom and Jerry character is: Jerry
Tom and Jerry character is: Spike
Tom and Jerry character is: Tyke
Tom and Jerry character is: Butch
Tom and Jerry character is: Tuffy
Tom and Jerry character is: Quacker

See this page for more for loop examples including explicit list, and command substitution using ksh for loops.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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