Ksh: How to get name of script when in same script


 
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# 8  
Old 05-24-2019
Quote:
Originally Posted by vgersh99
how about this approach [covering bash/ksh - might need to enhance it for other (zsh/sh/etc)]
Code:
#!/bin/ksh
#set -x

#echo "\$0 ->[${0}] \$# -> [${#}] \$_ -> [${_}] "
case "${0}" in
   -bash) thisFile="${BASH_ARGV[0]}"
          ;;
   *ksh) thisFile="${_}"
          ;;
   *)
      #thisFile="$(type -P ${0})"
      thisFile="$(whence ${0})"
      ;;
esac

echo "this file->[${thisFile}]"

That is an interesting way to find what we're looking for in bash. Looking at the bash man page, it isn't obvious to me why it works.

Unfortunately, it doesn't really work for ksh. It works the second time if you try the commands:
Code:
. scriptname
. scriptname

because ksh sets the variable named _ to the last argument passed to the most recently completed synchronous command. I.e., after the first time you run . scriptname, ksh sets _ to scriptname so the second time you run . scriptname $_ (and ${_}) expand to scriptname. But if you run the two commands:
Code:
echo "Hello World!"
. scriptname

When you're running the above script with ksh, the output from the dot command will be Hello World!, not scriptname.

Note also that having the #!/bin/ksh comment at the start of the script is misleading; the commands in this file will be run by whatever shell issued the command:
Code:
. scriptname

within the current shell execution environment at that time. Unlike, when you're executing a script directly (instead of dotting the script), the file named scriptname only has to be readable (it doesn't matter if it is executable).
These 2 Users Gave Thanks to Don Cragun For This Post:
# 9  
Old 05-25-2019
Well, I did remember discussing something similar in the past - here's the relevant thread.

Here's the modified test harness:
Code:
#!/usr/bin/ksh
# path to the script - includes if the script has been SOURCED: ". ./scriptPath.sh"
#
#set -x

#echo "\$0 ->[${0}] \$# -> [${#}] \$.sh.file-> [${.sh.file}] "
#thisFile="$(whence ${0})"
case "${0}" in
   -bash) thisFile="${BASH_SOURCE}"
          ;;
   *ksh) thisFile="${.sh.file}"
          ;;
   *)
      #thisFile="$(type -P ${0})"
      thisFile="$(whence ${0})"
      ;;
esac

echo "this file->[${thisFile}]"

Now it works for both: bash and ksh - when sourced OR executed.
Don,
I left the shebang so that the script could be either sourced OR executed.
These 2 Users Gave Thanks to vgersh99 For This Post:
# 10  
Old 05-25-2019
Quote:
Originally Posted by vgersh99
... ... ...

Now it works for both: bash and ksh - when sourced OR executed.
Don,
I left the shebang so that the script could be either sourced OR executed.
Thanks.

It still won't work with ksh88, but that will work fine with ksh93.
This User Gave Thanks to Don Cragun For This Post:
# 11  
Old 05-31-2019
vgersh99, that works! Thanks!
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