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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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suspend(1)                                                         User Commands                                                        suspend(1)

NAME
suspend - shell built-in function to halt the current shell SYNOPSIS
sh suspend csh suspend ksh suspend DESCRIPTION
sh Stops the execution of the current shell (but not if it is the login shell). csh Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su. ksh Stops the execution of the current shell (but not if it is the login shell). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5) SunOS 5.10 15 Apr 1994 suspend(1)
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