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Full Discussion: Trapped in pipe
Top Forums Shell Programming and Scripting Trapped in pipe Post 302386331 by Scott on Tuesday 12th of January 2010 07:19:15 AM
Old 01-12-2010
Hi.

You can try:

Code:
echo ${PIPESTATUS[*]}

to see the result of each command in the pipe (if not the command - but it's quite obvious what it means):

Code:
$ echo blah | mkdir a/b/c | xargs echo
mkdir: cannot create directory `a/b/c': No such file or directory

bash: echo: write error: Broken pipe
$ echo ${PIPESTATUS[*]}
1 1 0

To get the exit code of the last command in the pipe to fail only, use
Code:
$ set -o pipefail
$ mkdir x/y/y | xargs echo
mkdir: cannot create directory `x/y/y': No such file or directory
$echo $?
1

$ set +o pipefail
$ mkdir x/y/y | xargs echo
mkdir: cannot create directory `x/y/y': No such file or directory
$ echo $?
0

Edit: Just had the realisation that this is BASH only. This cfajohnson link shows how to do this in a POSIX way.

Last edited by Scott; 01-12-2010 at 08:50 AM..
 

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RESET(3)								 1								  RESET(3)

reset - Set the internal pointer of an array to its first element

SYNOPSIS
mixed reset (array &$array) DESCRIPTION
reset(3) rewinds $array's internal pointer to the first element and returns the value of the first array element. PARAMETERS
o $array - The input array. RETURN VALUES
Returns the value of the first array element, or FALSE if the array is empty. EXAMPLES
Example #1 reset(3) example <?php $array = array('step one', 'step two', 'step three', 'step four'); // by default, the pointer is on the first element echo current($array) . "<br /> "; // "step one" // skip two steps next($array); next($array); echo current($array) . "<br /> "; // "step three" // reset pointer, start again on step one reset($array); echo current($array) . "<br /> "; // "step one" ?> SEE ALSO
current(3), each(3), end(3), next(3), prev(3). PHP Documentation Group RESET(3)
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