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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
commitfc22b3d6507c6745911b9dfcc68f1e665ae13dbc (patch)
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parentInitial commit. (diff)
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Adding upstream version 4.22.0.upstream/4.22.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.48.5.
+.TH ENV "1" "April 2022" "GNU coreutils 9.1" "User Commands"
+.SH NAME
+env \- run a program in a modified environment
+.SH SYNOPSIS
+.B env
+[\fI\,OPTION\/\fR]... [\fI\,-\/\fR] [\fI\,NAME=VALUE\/\fR]... [\fI\,COMMAND \/\fR[\fI\,ARG\/\fR]...]
+.SH DESCRIPTION
+.\" Add any additional description here
+.PP
+Set each NAME to VALUE in the environment and run COMMAND.
+.PP
+Mandatory arguments to long options are mandatory for short options too.
+.TP
+\fB\-i\fR, \fB\-\-ignore\-environment\fR
+start with an empty environment
+.TP
+\fB\-0\fR, \fB\-\-null\fR
+end each output line with NUL, not newline
+.TP
+\fB\-u\fR, \fB\-\-unset\fR=\fI\,NAME\/\fR
+remove variable from the environment
+.TP
+\fB\-C\fR, \fB\-\-chdir\fR=\fI\,DIR\/\fR
+change working directory to DIR
+.TP
+\fB\-S\fR, \fB\-\-split\-string\fR=\fI\,S\/\fR
+process and split S into separate arguments;
+used to pass multiple arguments on shebang lines
+.TP
+\fB\-\-block\-signal\fR[=\fI\,SIG\/\fR]
+block delivery of SIG signal(s) to COMMAND
+.TP
+\fB\-\-default\-signal\fR[=\fI\,SIG\/\fR]
+reset handling of SIG signal(s) to the default
+.TP
+\fB\-\-ignore\-signal\fR[=\fI\,SIG\/\fR]
+set handling of SIG signal(s) to do nothing
+.TP
+\fB\-\-list\-signal\-handling\fR
+list non default signal handling to stderr
+.TP
+\fB\-v\fR, \fB\-\-debug\fR
+print verbose information for each processing step
+.TP
+\fB\-\-help\fR
+display this help and exit
+.TP
+\fB\-\-version\fR
+output version information and exit
+.PP
+A mere \- implies \fB\-i\fR. If no COMMAND, print the resulting environment.
+.PP
+SIG may be a signal name like 'PIPE', or a signal number like '13'.
+Without SIG, all known signals are included. Multiple signals can be
+comma\-separated.
+.SH OPTIONS
+.SS "\-S/\-\-split\-string usage in scripts"
+The
+.B \-S
+option allows specifying multiple parameters in a script.
+Running a script named
+.B 1.pl
+containing the following first line:
+.PP
+.RS
+.nf
+#!/usr/bin/env \-S perl \-w \-T
+\&...
+.fi
+.RE
+.PP
+Will execute
+.B "perl \-w \-T 1.pl".
+.PP
+Without the
+.B '\-S'
+parameter the script will likely fail with:
+.PP
+.RS
+.nf
+/usr/bin/env: 'perl \-w \-T': No such file or directory
+.fi
+.RE
+.PP
+See the full documentation for more details.
+.PP
+.SS "\-\-default-signal[=SIG]" usage
+This option allows setting a signal handler to its default
+action, which is not possible using the traditional shell
+trap command. The following example ensures that seq
+will be terminated by SIGPIPE no matter how this signal
+is being handled in the process invoking the command.
+
+.PP
+.RS
+.nf
+sh \-c 'env \-\-default-signal=PIPE seq inf | head \-n1'
+.fi
+.RE
+.PP
+.SH NOTES
+POSIX's \fBexec\fP(3p) pages says:
+.RS
+"many existing applications wrongly assume that they start with certain
+signals set to the default action and/or unblocked.... Therefore, it is best
+not to block or ignore signals across execs without explicit reason to do so,
+and especially not to block signals across execs of arbitrary (not closely
+cooperating) programs."
+.RE
+.SH AUTHOR
+Written by Richard Mlynarik, David MacKenzie, and Assaf Gordon.
+.SH "REPORTING BUGS"
+GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
+.br
+Report any translation bugs to <https://translationproject.org/team/>
+.SH COPYRIGHT
+Copyright \(co 2022 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+.br
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+.SH "SEE ALSO"
+\fBsigaction\fP(2), \fBsigprocmask\fP(2), \fBsignal\fP(7)
+.PP
+.br
+Full documentation <https://www.gnu.org/software/coreutils/env>
+.br
+or available locally via: info \(aq(coreutils) env invocation\(aq