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Full Discussion: Unknown test operator
Top Forums Shell Programming and Scripting Unknown test operator Post 302843633 by Jotne on Wednesday 14th of August 2013 08:38:51 AM
Old 08-14-2013
The backticks have been deprecated in favor of $() for command substitution because $() can easily nest within itself as in $(echo foo$(echo bar)). There are also minor differences such as how backslashes are parsed in the backticks version.
Eks
echo "hello1-`echo hello2-\`echo hello3-\\\`echo hello4\\\`\``"
vs
echo "hello1-$(echo hello2-$(echo hello3-$(echo hello4)))"

Its also hard do see difference between ' and `
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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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