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I have created a audit.ksh file which is used to clear old "*.aud" files. But when i run this file am getting below error. The strange thing is the commands inside the file works fine while executing openly in prompt.The user is in C shell. 

TxxxxD01:user 55>./aud_clean.ksh
export RES_RETRY=1: 0402-026 The specified data is not a valid identifier.
TxxxxD01:user 56> echo $SHELL
/usr/bin/csh
TxxxxD01:user 57> cat aud_clean.ksh
cd /oracle/SID/saptrace/audit
find *.aud -mtime +3 -exec rm {} \;
TxxxxD01:user 60> cd /oracle/SID/saptrace/audit
TxxxxD01:user 61> find *.aud -mtime +3 -exec rm {} \;
TxxxxD01:user 62>
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  • You should also look into why your shell initialization files are pulling in /etc/environment; that should be unnecessary. Commented Apr 25, 2019 at 11:14

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Your ksh shell script does not have a sh-bang line indicating that it should be run with ksh, so your csh shell is attempting to run it (with /bin/sh, which is the one complaining about the export RES_RETRY=1 syntax). Add a sh-bang line of

#!/bin/ksh

to the top of the script.

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  • The csh shell executes a shebang-less script using sh (Which shell interpreter runs a script with no shebang?). There may be a shell initialisation file that sh executes that has an error, but I don't know what file that would be (~/.profile should only be read for login shells), $ENV may possibly be defined though. Commented Apr 25, 2019 at 10:35
  • Good point; and RES_RETRY appears to be a DNS configuration item, which shouldn't be getting pulled into shell initialization files (and clearly isn't part of the ksh script). Commented Apr 25, 2019 at 10:54
  • No, csh will execute non-shebanged scripts with /bin/sh, not with csh. The problem is that the export VAR=val syntax is not supported in some ancient shells -- you have to write VAR=val; export VAR there. Your solution of adding the #! /bin/ksh shebang works, because ksh does support that syntax. But the rationale is off. Commented Apr 25, 2019 at 11:11
  • Thank you to mosvy and Kusalananda; I've updated the answer to clarify the behavior. Commented Apr 25, 2019 at 11:13

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