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Top Forums Shell Programming and Scripting For loop without checking file exists Post 302971438 by rovf on Wednesday 20th of April 2016 07:18:29 AM
Old 04-20-2016
I think in ksh it is

set -o noglob

The disadvantage of this (and of bash's nullglob) is that the option is turned on until you turn it off explicitly. I suggest that you switch to zsh, where you can define this behaviour for each pattern separately. In zsh, the loop would be written as

Code:
    for fn in N???(N)
    do
        ....
    done

and the body would be skipped if there is no file matching the pattern; no error message here. While zsh differs in several ways from ksh/bash/dash, I find it much more convenient for shell programming than the other ones.
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PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME
pidof -- find the process ID of a running program. SYNOPSIS
pidof [-s] [-x] [-o omitpid] [-o omitpid..] program [program..] DESCRIPTION
Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead. OPTIONS
-s Single shot - this instructs the program to only return one pid. -x Scripts too - this causes the program to also return process id's of shells running the named scripts. -o Tells pidof to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro- gram, in other words the calling shell or shell script. NOTES
pidof is simply a (symbolic) link to the killall5 program, which should also be located in /sbin. When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs. SEE ALSO
shutdown(8), init(8), halt(8), reboot(8) AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl 01 Sep 1998 PIDOF(8)
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