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Top Forums Shell Programming and Scripting How to remove leading and trailing spaces for variable in shell script? Post 303024913 by Don Cragun on Friday 19th of October 2018 02:42:28 AM
Old 10-19-2018
If there aren't any embedded <space>s in your variable, the command:
Code:
tablename=${tablename// /}

will remove all of the leading and trailing (and embedded) <space>s in your variable. If there are embedded <space>s you need to preserve you can use:
Code:
while [[ $tablename != ${tablename# } ]]
do	tablename=${tablename# }	# Remove one leading <space> from tablename.
done
while [[ $tablename != ${tablename% } ]]
do	tablename=${tablename% }	# Remove one trailing <space> from tablename.
done
printf 'Updated tablename with zero or more embedded spaces is "%s"\n' "$tablename"

Neither of the above are portable scripts, but all should work in your environment.

For a script meeting your requirements that should work with any shell that performs all of the expansions required by the POSIX standards, you could try
Code:
while [ "$tablename" != "${tablename# }" ]
do	tablename=${tablename# }	# Remove one leading <space> from tablename.
done
while [ "$tablename" != "${tablename% }" ]
do	tablename=${tablename% }	# Remove one trailing <space> from tablename.
done
printf 'Updated tablename with zero or more embedded spaces is "%s"\n' "$tablename"

 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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