Why does my shell script gives the error: "declare: not found", when executed in ksh shell?

Solution Verified - Updated -

Issue

  • A shell script gives the error: "declare: not found", when executed in ksh shell.

    # echo $0
ksh
# ls -l /home/testksh/tmout.sh
-rwxr-xr-x. 1 root root 22 Sep 26 20:01 /home/testksh/tmout.sh
# cat /home/testksh/tmout.sh
declare -rx TMOUT=900
# /home/testksh/tmout.sh
/home/testksh/tmout.sh[1]: declare: not found [No such file or directory]

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • ksh

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