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Top Forums Shell Programming and Scripting Help with validation of URLs in shell script Post 303007957 by RudiC on Friday 24th of November 2017 03:56:20 AM
Old 11-24-2017
Please become accustomed to provide decent context info of your problem.

It is always helpful to carefully and detailedly phrase a request, and to support it with system info like OS and shell, related environment (variables, options), preferred tools, adequate (representative) sample input and desired output data and the logics connecting the two including your own attempts at a solution, and, if existent, system (error) messages verbatim, to avoid ambiguities and keep people from guessing.
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ENVSUBST(1)								GNU							       ENVSUBST(1)

NAME
envsubst - substitutes environment variables in shell format strings SYNOPSIS
envsubst [OPTION] [SHELL-FORMAT] DESCRIPTION
Substitutes the values of environment variables. Operation mode: -v, --variables output the variables occurring in SHELL-FORMAT Informative output: -h, --help display this help and exit -V, --version output version information and exit In normal operation mode, standard input is copied to standard output, with references to environment variables of the form $VARIABLE or ${VARIABLE} being replaced with the corresponding values. If a SHELL-FORMAT is given, only those environment variables that are referenced in SHELL-FORMAT are substituted; otherwise all environment variables references occurring in standard input are substituted. When --variables is used, standard input is ignored, and the output consists of the environment variables that are referenced in SHELL-FOR- MAT, one per line. AUTHOR
Written by Bruno Haible. REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>. COPYRIGHT
Copyright (C) 2003-2007 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for envsubst is maintained as a Texinfo manual. If the info and envsubst programs are properly installed at your site, the command info envsubst should give you access to the complete manual. GNU gettext-runtime 0.18.1 June 2010 ENVSUBST(1)
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