diff options
| author | Xin LI <delphij@FreeBSD.org> | 2012-12-03 21:49:37 +0000 |
|---|---|---|
| committer | Xin LI <delphij@FreeBSD.org> | 2012-12-03 21:49:37 +0000 |
| commit | 266ab5afbc6791f8ad90791f99066c6a29e21593 (patch) | |
| tree | 0336e9d0aae6c87c529a3d589fbbc652b9cf3bce /usr.bin/less | |
| parent | 4153fe7216a342244b555bfd03609e28604df202 (diff) | |
| download | src-test-266ab5afbc6791f8ad90791f99066c6a29e21593.tar.gz src-test-266ab5afbc6791f8ad90791f99066c6a29e21593.zip | |
Note that the manual page of less(1) says:
Note that a preprocessor cannot output an empty file, since that
is interpreted as meaning there is no replacement, and the origi-
nal file is used. To avoid this, if LESSOPEN starts with two ver-
tical bars, the exit status of the script becomes meaningful. If
the exit status is zero, the output is considered to be replace-
ment text, even if it empty. If the exit status is nonzero, any
output is ignored and the original file is used. For compatibil-
ity with previous versions of less, if LESSOPEN starts with only
one vertical bar, the exit status of the preprocessor is ignored.
Use two pipe symbols for zless, so that zless'ing a compressed empty
file will give output rather than being interpreted as its compressed
form, which is typically a binary.
Thanks Mark Nudelman for pointing out this difference and the
suggested solution.
Reported by: Matthias Meyser <meyser xenet.de>
PR: bin/168839
MFC after: 2 weeks
Notes
Notes:
svn path=/head/; revision=243834
Diffstat (limited to 'usr.bin/less')
| -rw-r--r-- | usr.bin/less/zless.sh | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/usr.bin/less/zless.sh b/usr.bin/less/zless.sh index b947b819f2c04..f2e035c2d7e25 100644 --- a/usr.bin/less/zless.sh +++ b/usr.bin/less/zless.sh @@ -3,5 +3,5 @@ # $FreeBSD$ # -export LESSOPEN="|/usr/bin/lesspipe.sh %s" +export LESSOPEN="||/usr/bin/lesspipe.sh %s" exec /usr/bin/less "$@" |