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Full Discussion: Bash variable assignment failure/unary operator expected
Top Forums Shell Programming and Scripting Bash variable assignment failure/unary operator expected Post 303012606 by MadeInGermany on Tuesday 6th of February 2018 03:01:05 PM
Old 02-06-2018
Because the while block is fed by a pipe, it is run in a sub shell.
The sub shell inherits (gets copied) variables from the main shell, but not vice versa.
Only the ksh (and true derivatives- not mksh!) runs the last part of a pipe in the main shell.
So you can run your script with ksh.scriptname, or change the shebang to #!/bin/ksh.
If you want to stay with bash, you must recode your script.
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LEARN ABOUT OPENDARWIN

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)
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