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Top Forums UNIX for Advanced & Expert Users Running scripts without a hashbang - ksh anomaly? Post 302911146 by CarloM on Wednesday 30th of July 2014 11:26:18 AM
Old 07-30-2014
Running scripts without a hashbang - ksh anomaly?

I noticed some strange looking parameters on some processes on one of our servers, and after a little playing around we deduced that ksh seemed to be adding a (somewhat random) extra parameter when calling a script without a hashbang in it.

It looks like it's the partial name of the parent script (and not always the same number of characters). I'm thinking it's not just a display artifact as it's in /proc/xxx/cmdline as well. However, the script arguments don't see it.

It doesn't happen if the child script has a hashbang or is called explicitly with ksh, or if the parent script is run with bash.

It doesn't appear to be causing any actual problem for the real script, but it seems a tad odd.


Can anyone shed any light on this?

An example:
Code:
$ cat SomeScriptOrOther.sh
#!/bin/ksh

ksh ./sleep.sh PARAM1 PARAM2
./sleep.sh PARAM1 PARAM2

echo "Wibble"

$ cat sleep.sh
echo $# "$@"
ps -Hfu $USER
sleep 1
$ ./SomeScriptOrOther.sh
2 PARAM1 PARAM2
UID        PID  PPID  C STIME TTY          TIME CMD
14347     8996  8989  0 15:53 ?        00:00:00 sshd: carlo@pts/0
14347     8997  8996  0 15:53 pts/0    00:00:00   -bash
14347    11273  8997  0 16:00 pts/0    00:00:00     /bin/ksh ./SomeScriptOrOther.sh
14347    11274 11273  0 16:00 pts/0    00:00:00       ksh ./sleep.sh PARAM1 PARAM2
14347    11275 11274  0 16:00 pts/0    00:00:00         ps -Hfu carlo
2 PARAM1 PARAM2
UID        PID  PPID  C STIME TTY          TIME CMD
14347     8996  8989  0 15:53 ?        00:00:00 sshd: carlo@pts/0
14347     8997  8996  0 15:53 pts/0    00:00:00   -bash
14347    11273  8997  0 16:00 pts/0    00:00:00     /bin/ksh ./SomeScriptOrOther.sh
14347    11278 11273  0 16:00 pts/0    00:00:00       ./sleep.sh PARAM1 PARAM2 her.sh
14347    11279 11278  0 16:00 pts/0    00:00:00         ps -Hfu carlo
Wibble

Code:
$ ksh --version
  version         sh (AT&T Research) 93t+ 2010-06-21

 

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PTS_SLEEP(1)						       AFS Command Reference						      PTS_SLEEP(1)

NAME
pts_sleep - Pauses for a few seconds SYNOPSIS
pts sleep [-delay] <# of seconds> [-cell] <cell name> [-noauth] [-localauth] [-force] pts sl [-d] <# of seconds> [-c] <cell name> [-n] [-l] [-f] DESCRIPTION
The pts sleep pauses for a specified number of seconds. The command can be run from the command line or interactively, although from the command line it's essentially equivalent to the sleep command. It is intended for use in interactive mode to pause for a few seconds between batch commands to allow the Protection Server to catch up. CAUTIONS
Prior to OpenAFS 1.4.5 and OpenAFS 1.5.23, the pts sleep command was only available on Unix or Linux and when OpenAFS was compiled with the supergroups option (disabled by default). As of OpenAFS 1.4.5 and 1.5.23, it is always available. OPTIONS
Although they have no effect, pts sleep takes the following standard pts options: -cell <cell name> Names the cell in which to run the command. For more details, see pts(1). -force Enables the command to continue executing as far as possible when errors or other problems occur, rather than halting execution at the first error. -help Prints the online help for this command. All other valid options are ignored. -localauth Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile file. Do not combine this flag with the -cell or -noauth options. For more details, see pts(1). -noauth Assigns the unprivileged identity anonymous to the issuer. For more details, see pts(1). OUTPUT
This command produces no output. EXAMPLES
Here is an example of a pts interactive session: % pts interactive pts> sleep 5 pts> quit % SEE ALSO
pts(1), pts_interactive(1) COPYRIGHT
Copyright 2007 Jason Edgecombe <jason@rampaginggeek.com> This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Jason Edgecombe for OpenAFS. OpenAFS 2014-04-08 PTS_SLEEP(1)

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