06-24-2016
You seem to have at least heard of redirections, but >> is MEANT to append to files, so above described behaviour is no surprise. Don't use the single > to the input file either as it would destroy the target and thus the input before it can be read.
Try > TMP && mv TMP file (which might lose the original file's attributes).
This User Gave Thanks to RudiC For This Post:
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LEARN ABOUT DEBIAN
shtool-arx
SHTOOL-ARX.TMP(1) GNU Portable Shell Tool SHTOOL-ARX.TMP(1)
NAME
shtool-arx - GNU shtool ar(1) extensional command
SYNOPSIS
shtool arx [-t|--trace] [-C|--command cmd] op archive file [file ...]
DESCRIPTION
shtool arx is a wrapper around the archiving tool ar(1). It provides the ability to create archives out of existing archives, i.e., if one
of file matches ""*.a"", the archive member files of file are used instead of file itself.
The trick of this command is the automatic handling of archive members which is especially interesting if one wants to construct a (usually
top-level) library archive out of pre-built sub-library archives (usually staying inside subdirs) in a large source tree. For GNU libtool
based projects, a similar functionality is provided by GNU libtool internally, too.
OPTIONS
The following command line options are available.
-t, --trace
Shows the actually involved shell commands.
-C, --command cmd
Set the used ar(1) command to cmd instead of just "ar" (searched in $PATH).
EXAMPLE
# Makefile
AR=ar
RANLIB=ranlib
:
OBJS=foo.o bar.o
LIBS=baz/libbaz.a quux/libquux.a
:
libfoo.a: $(OBJS) $(LIBS)
shtool arx -C $(AR) rc libfoo.a $(OBJS) $(LIBS)
$(RANLIB) libfoo.a
HISTORY
The GNU shtool arx command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1999 for GNU shtool. It was prompted by
need to build libraries out of sub-libraries inside the OSSP project.
SEE ALSO
shtool(1), ar(1).
18-Jul-2008 shtool 2.0.8 SHTOOL-ARX.TMP(1)