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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 LINUX

suspend

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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