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POSIX is an acronym for Portable Operating System Interface, a family of standards specified by the IEEE for maintaining compatibility between operating systems.

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According to chapter 9. Regular Expressions, subchapter 9.3.6 BREs Matching Multiple Characters, number "3.": "... the expression "\(a\(b\)*\)*\2" fails to match 'abab' ...&...
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Why is it that a Process Group Leader can't change its PGID? I know it sounds dumb for a leader to just abandon its own group, but what is the actual architectural reason behind this? What would ...
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I have the following code: set -e log=$( false ; true ) echo "success(?)" It exits with error code 1 when run via sh (as expected), but succeeds with bash. I figured (and read) that bash ...
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For example, from OpenSSH: echo "usage: ${PROGNAME} [OPTION]..." echo echo "This script creates an OpenSSH user configuration." echo echo "Options:" echo " --...
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On a Debian system, man 3 errno tells that the code names (ENOENT) are portable, but the integers in errno are not. If an error is reported, the name instead of the integer number is therefore the ...
Rainer Glaschick's user avatar
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According to the Shell Command Language Specification: "2.7.4 Here-Document": Any <backslash> characters in the input shall behave as the <backslash> inside double-quotes (see 2....
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Why isn't $ chmod + .profile an error? Shouldn't the user have added some extra character to make the command do something?
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Context: I want to process a file created by another program, but the name of its output file is not completely under my control, so to find its output I use find to find all files in the output ...
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I'm writing a shell script that's aimed to be as portable and POSIX-compatible as possible, so usage of bash-only commands or high-level input libraries is undesirable. I'm looking for a way to read a ...
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I have the following file below, $ cat voltages.txt "-0.20" "-0.10" "-0.00" "-0.10" "-0.20" "-0.30" "-0.40" "-0.50" &...
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How can I prevent command substitution in arguments from silently swallowing errors? #!/bin/sh set -e echo "Evaluating $(false) should abort." echo "This line should not be executed.&...
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I am using this code to parse the first argument passed to my script. It error handles and it works just the way I want it: if [ -z "$action" ]; then printf "[${c_RED}ERROR${c_RESET}...
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I am new to socket programming & I have realized that most posix functions from libc require that you pass a buffer & a length. While I can understand this helps the functions to understand ...
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Can someone explain the issue I've described below, and perhaps suggest a resolution? I'm trying to process a set of filenames using find. My platform is macOS (Ventura 13.7.7), and the shell is zsh ...
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I have a remote system where I can create only files and directories. No symlinks, ACLs, hard links, devices, nothing. I think, it would be really useful to be able to use it even as a linux root ...
peterh's user avatar
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