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Top Forums UNIX for Beginners Questions & Answers Substitute a character with sed Post 303032326 by jim mcnamara on Friday 15th of March 2019 09:06:43 AM
Old 03-15-2019
Speaking strictly as a scientist: python ruby, and julia are extremely important for research and analysis.

GNU supports the environment variable POSIXLY_CORRECT. This helps a lot when you are porting code back and forth between several platforms. I would suggest that you check it out. Defining it changes behavior to be pretty close to POSIX. Not perfect, IMO.

Linux is effectively inescapable in modern data centers. Even appliances like routers run on embedded Linux. So does your refrigerator ....

GNU.org position on POSIX:
GNU Coding Standards: Non-GNU Standards

Some OSes kind of go off the deep end in attempt to be a sort of "all versions of standards" - which is kind of what you are discussing here.

Solaris is an example:

Compliance with standards in that OS - for a new user or somebody porting an app - can be confusing. You get different versions of awk, tr and so on. This depends on which of several possible paths, and their order, ex: /usr/xpg4/bin versus /usr/bin, you have set up in PATH. This can break a lot of things that worked correctly on HP-UX but not Solaris, for example. I spent a lot of time tweaking the PATH variable for different applications and their associated users

XPG4 -
man pages section 5: Standards, Environments, and Macros


Don Cragun here actively works on standards, and definitely will have have some opinions here.
 

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SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME
shtool-subst - GNU shtool sed(1) substitution operations SYNOPSIS
shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext] [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...] DESCRIPTION
This command applies one or more sed(1) substitution operations to stdin or any number of files. OPTIONS
The following command line options are available. -v, --verbose Display some processing information. -t, --trace Enable the output of the essential shell commands which are executed. -n, --nop No operation mode. Actual execution of the essential shell commands which would be executed is suppressed. -w, --warning Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution operations resulted in no content change on all files. -q, --quiet Suppress warning on substitution operation resulting in no content change. -s, --stealth Stealth operation. Preserve timestamp on file. -i, --interactive Enter interactive mode where the user has to approve each operation. -b, --backup ext Preserve backup of original file using file name extension ext. Default is to overwrite the original file. -e, --exec cmd Specify sed(1) command directly. -f, --file cmd-file Read sed(1) command from file. EXAMPLE
# shell script shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch] # RPM spec-file %install shtool subst -v -n -e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' -e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' `find . -name Makefile -print` make install HISTORY
The GNU shtool subst command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 2001 for GNU shtool. It was prompted by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications. SEE ALSO
shtool(1), sed(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-SUBST.TMP(1)
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