Shell Programming and Scripting

This is one of the subtle differences you need to watch out for when porting shell scripts. Consider a slightly modified version of Jim's example, i.e.

Code:

#!/bin/bash 

a=1
cat $0 | while read rec
do
   (( a++ ))
done

echo $a

Bash outputs 1 but ksh93 and zsh output the number of lines in the script file (10)

I should have been more precise in my post. What I said does not refer to all bash while loops, but to bash while loops which read from a pipe, as does the snippet of code which I quoted in my earlier post.

Apologies for any confusion that my lack of precision may have caused.

Regards,
Alister

---------- Post updated at 11:23 PM ---------- Previous update was at 11:10 PM ----------

Absolutely. Also, the differing behaviors are posix-compliant (you did not imply otherwise, just stating it in case anyone else is wondering ):
More @ Shell Command Language

The text in red is a pointlessly verbose way of saying, "the standard has nothing to say".

Regards,
Alister