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Full Discussion: Shellscripting -z option
Top Forums Shell Programming and Scripting Shellscripting -z option Post 303037905 by cokedude on Friday 16th of August 2019 04:40:34 PM
Old 08-16-2019
Shellscripting -z option

Can someone explain the -z option in shellscripting.

I did this. When I was in both ksh and bash it echoed back hi.

Code:
#!/bin/ksh

if [ -z "$BASH_VERSION" ]
then
    echo hi

fi

When I echoed $BASH_VERSION in bash it gave a version. When I echoed $BASH_VERSION in ksh it was blank.

I thought -z was only true if the length of the string is 0? This is what my man page says.

Code:
-z string = True if the length of the string is 0.

 

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shells(4)							   File Formats 							 shells(4)

NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list. Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1). FILES
/etc/shells list of shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.11 20 Nov 2007 shells(4)
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