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'\" t .\" Title: sponge .\" Author: Joey Hess .\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> .\" Date: 2006-02-19 .\" Manual: moreutils .\" Source: moreutils .\" Language: English .\" .TH "SPONGE" "1" "2006\-02\-19" "moreutils" "moreutils" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" sponge \- soak up standard input and write to a file .SH "SYNOPSIS" .HP \w'\fBsed\ \*(Aq\&.\&.\&.\*(Aq\ file\ |\ grep\ \*(Aq\&.\&.\&.\*(Aq\ |\ sponge\ [\-a]\ file\fR\ 'u \fBsed \*(Aq\&.\&.\&.\*(Aq file | grep \*(Aq\&.\&.\&.\*(Aq | sponge [\-a] file\fR .SH "DESCRIPTION" .PP \fBsponge\fR reads standard input and writes it out to the specified file\&. Unlike a shell redirect, \fBsponge\fR soaks up all its input before writing the output file\&. This allows constructing pipelines that read from and write to the same file\&. .PP \fBsponge\fR preserves the permissions of the output file if it already exists\&. .PP When possible, \fBsponge\fR creates or updates the output file atomically by renaming a temp file into place\&. (This cannot be done if TMPDIR is not in the same filesystem\&.) .PP If the output file is a special file or symlink, the data will be written to it, non\-atomically\&. .PP If no file is specified, \fBsponge\fR outputs to stdout\&. .SH "OPTIONS" .PP \fB\-a\fR .RS 4 Replace the file with a new file that contains the file\*(Aqs original content, with the standard input appended to it\&. This is done atomically when possible\&. .RE .SH "AUTHOR" .PP Colin Watson and Tollef Fog Heen