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Full Discussion: Understanding Xargs
Top Forums Shell Programming and Scripting Understanding Xargs Post 303010087 by RudiC on Tuesday 26th of December 2017 10:06:17 AM
Old 12-26-2017
A string in *nix is a sequence of (not necessarily printable) characters terminated by a null (0x00) character.

xargs usually collects lines read from stdin into one or more long (influenced by several options) parameter lists and executes the command / utility one or more times with the respective parameter list. With the -I option you can define where in that command execution the data from stdin show up. I'd recommend you do some exercises and testing with some innocuous commands and the -t (verbose) option.
 

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GIT-CHECK-IGNORE(1)						    Git Manual						       GIT-CHECK-IGNORE(1)

NAME
git-check-ignore - Debug gitignore / exclude files SYNOPSIS
git check-ignore [options] pathname... git check-ignore [options] --stdin < <list-of-paths> DESCRIPTION
For each pathname given via the command-line or from a file via --stdin, show the pattern from .gitignore (or other input files to the exclude mechanism) that decides if the pathname is excluded or included. Later patterns within a file take precedence over earlier ones. OPTIONS
-q, --quiet Don't output anything, just set exit status. This is only valid with a single pathname. -v, --verbose Also output details about the matching pattern (if any) for each given pathname. --stdin Read file names from stdin instead of from the command-line. -z The output format is modified to be machine-parseable (see below). If --stdin is also given, input paths are separated with a NUL character instead of a linefeed character. OUTPUT
By default, any of the given pathnames which match an ignore pattern will be output, one per line. If no pattern matches a given path, nothing will be output for that path; this means that path will not be ignored. If --verbose is specified, the output is a series of lines of the form: <source> <COLON> <linenum> <COLON> <pattern> <HT> <pathname> <pathname> is the path of a file being queried, <pattern> is the matching pattern, <source> is the pattern's source file, and <linenum> is the line number of the pattern within that source. If the pattern contained a ! prefix or / suffix, it will be preserved in the output. <source> will be an absolute path when referring to the file configured by core.excludesfile, or relative to the repository root when referring to .git/info/exclude or a per-directory exclude file. If -z is specified, the pathnames in the output are delimited by the null character; if --verbose is also specified then null characters are also used instead of colons and hard tabs: <source> <NULL> <linenum> <NULL> <pattern> <NULL> <pathname> <NULL> EXIT STATUS
0 One or more of the provided paths is ignored. 1 None of the provided paths are ignored. 128 A fatal error was encountered. SEE ALSO
gitignore(5) gitconfig(5) git-ls-files(5) GIT
Part of the git(1) suite Git 1.8.3.1 06/10/2014 GIT-CHECK-IGNORE(1)
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