INPLACE(3am) GNU Awk Extension Modules INPLACE(3am)
NAME
inplace - emulate sed/perl/ruby in-place editing
SYNOPSIS
gawk -i inplace ...
DESCRIPTION
The inplace extension adds two functions named inplace_begin() and in-
place_end(). These functions are meant to be invoked from the in-
place.awk wrapper which is installed when gawk is.
By default, each named file on the command line is replaced with a new
file of the same name whose contents are the results of running the AWK
program. If the user supplies an AWK variable named inplace::suffix in
a BEGIN rule or on the command line, then the inplace extension con-
catenates that suffix onto the original filename and uses the result as
a filename for renaming the original.
For backwards compatibility, the variable will also check INPLACE_SUF-
FIX (in the awk namespace) for the suffix to use if inplace::suffix is
not set.
One can disable inplace editing selectively by placing inplace::en-
able=0 on the command line prior to files that should be processed nor-
mally. One can reenable inplace editing by placing inplace::enable=1
prior to files that should be subject to inplace editing.
BUGS
While the extension does attempt to preserve ownership and permissions,
it makes no attempt to copy the ACLs from the original file.
If the program dies prematurely, as might happen if an unhandled signal
is received, a temporary file may be left behind.
EXAMPLE
gawk -i inplace 'script' files ...
gawk -i inplace -f scriptfile files ...
SEE ALSO
GAWK: Effective AWK Programming, filefuncs(3am), fnmatch(3am),
fork(3am), ordchr(3am), readdir(3am), readfile(3am), revoutput(3am),
rwarray(3am).
AUTHOR
Andrew Schorr, schorr@telemetry-investments.com.
COPYING PERMISSIONS
Copyright © 2012, 2013, 2015, 2018, 2019, Free Software Foundation,
Inc.
Permission is granted to make and distribute verbatim copies of this
manual page provided the copyright notice and this permission notice
are preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual page under the conditions for verbatim copying, provided that
the entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Permission is granted to copy and distribute translations of this man-
ual page into another language, under the above conditions for modified
versions, except that this permission notice may be stated in a trans-
lation approved by the Foundation.
Free Software Foundation Jun 26 2018 INPLACE(3am)
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