10-09-2008
checking variable has value - ksh
hi all,
i have a shell (ksh) script where i am reading line by line from a grep command and i wanted to check if the grep command actually returned something or was null. i can do this by using -z :
if [ -z "$myVariable" ]; then .....
but this forces me to do something when $myVariable is null when i would like to just move on to the next line. how do i do that ??
have tried if [ ! -z "$myVariable" ]; then .....
but it threw some errors.
many thanks.
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LEARN ABOUT XFREE86
times
times(1) User Commands times(1)
NAME
times - shell built-in function to report time usages of the current shell
SYNOPSIS
sh
times
ksh
times
DESCRIPTION
sh
Print the accumulated user and system times for processes run from the shell.
ksh
Print the accumulated user and system times for the shell and for processes run from the shell.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
ksh(1), sh(1), time(1), attributes(5)
SunOS 5.10 15 Apr 1994 times(1)