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Full Discussion: Shellscripting -z option
Top Forums Shell Programming and Scripting Shellscripting -z option Post 303037910 by jim mcnamara on Friday 16th of August 2019 06:37:27 PM
Old 08-16-2019
Your script as originally posted showed a shebang for ksh.
Here is what I get:
Code:
$ cat t.shl
#!/bin/bash

if [ -z "$BASH_VERSION" ]
then
    echo hi
else
    echo "characters found"
fi

Owner@Owner-PC ~
$ ./t.shl
characters found

Next, I have dash not ksh so:
Code:
$ cat t.shl
#!/bin/dash

if [ -z "$BASH_VERSION" ]
then
    echo hi
else
    echo "characters found"
fi

Owner@Owner-PC ~
$ ./t.shl
hi

Both work as expected. So I cannot duplicate your problem. Which means to me you did not use shebang invocation and/or you got mixed up results you could not interpret. There is no other answer ...that I can see.
 

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SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME
surfraw-update-path - updates PATH in shell config files SYNOPSIS
surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL] DESCRIPTION
surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file. Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es Don't forget to login again or source your login files for it to take effect. OPTIONS
-check Checks to see if the surfraw config code is present. This is the default. -add Adds the surfraw config code. -remove Removes the surfraw config code -sys Updates the system-wide shell config instead of the user. Must be done as root. -shell=SHELL Selects the shell to configure. Defaults to the value of the $SHELL environment variable. Currently supported shells are: sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es. -all Attempts to configure the startup files for all known shells -help Gives a usage message RETURN VALUE
-check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error. All other options return 0 on success, or 2 on error. ENVIRONMENT
SHELL Used to determine which shell to configure, if -shell is not given. HOME Used to find users config files. ENV Used by posix-compliant shells to specify a startup rc file. ZDOTDIR Used to find user config files for zsh. If not set, defaults to HOME. SEE ALSO
surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1) AUTHOR
Ian Beckwith <ianb@erislabs.net> perl v5.12.4 2011-07-12 SURFRAW-UPDATE-PATH(1)
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