Read a gzipped text file directly with less.

less textfile.gz
There is no need to 'zcat textfile.gz | less' with newer distros. This is useful for reading archived log files without having to extract, read, and zip when done.

-5
By: allbad
2009-03-15 23:51:17

What Others Think

Again, 'less' can't do this. Read the man page. zcat textfile.gz | less
atoponce · 663 weeks and 1 day ago
it's working, but it's more handy for me: zcat file.gz |grep stuff |more
gladia2r · 663 weeks and 1 day ago
and again. Yes, less can do this.
elzapp · 663 weeks and 1 day ago
atoponce is right. Read the man page. The less version 418 manpage has no hits for 'gzip' or 'gz' strings when I just searched it. So I don't think less *the program* supports this. However, it's possibly that your system is setup in such a way that you *think* less does. In some distributions, I believe less actually invokes 'zless', which is a bash script (/bin/zless) on my ubuntu system. I remember when I used to run gentoo that, I think, the less->zless link was present. If your file was gzip compressed, then it displayed properly, yay, but if not, it displayed OK too. The other way less may support gzip-compressed files is hinted at in the manpage for zless, and documented in the less manpage, under the "INPUT PREPROCESSOR" section. That method is to set some environment variables for less, such that it uses other tools to first filter (uncompress, here) the file before displaying it. So I normally try: zless textfile.gz Back in 2004, their was a wapper script for less and more posted on a debian mailing list which would uncompress files: http://lists.debian.org/debian-devel/2004/02/msg01128.html So some day when you invoke less, the "right thing" will happen and the terminal will display your file for you - but it's not due to less, it's due to a wrapper script or (more crude) symlink.
bwoodacre · 663 weeks ago
Less cannot do this, however many systems have wrapped less up so that if given a .gz file it will uncompress it and pipe it through zless is an explicit filter that does this, and will work for gzipped files that do not end in .gz
ant · 663 weeks ago
zless is nothing more than a bash script hack. It invokes gzip, pipes it to STDOUT, and uses less to parse the output. As such, surprise, surprise, less doesn't read binaries, including gzip files. People need to spend time reading the docs, and learning their system.
atoponce · 662 weeks and 6 days ago
Ubuntu and Fedora both set environment vars: Ubuntu: set | grep -i less LESSCLOSE='/usr/bin/lesspipe %s %s' LESSOPEN='| /usr/bin/lesspipe %s' Fedora: set | grep -i less LESSOPEN='|/usr/bin/lesspipe.sh %s' lesspipe.sh is a shell script that handles adapting the input to work with less.
bitmage · 662 weeks and 5 days ago
@bitmage you are called bitMAGE for a reason! I didn't know this either, nor did I believe it. But I was convinced once I hacked in the following one-liner into /usr/bin/lesspipe: echo "calling $0" && sleep 2 Guess what, the echo line came up, so this stuff *IS* routed via lesspipe. Well spotted. I hope that this myth has ended once and for all that "new less version can even 'load gzipped files'". (Unlike tar, where you can INDEED use tar xvf to unpack (pk)zipped files (only legit way in older versions was: tar zxvf)
syntaxerror74 · 364 weeks and 5 days ago
So glad to get this weblog how to get free v-bucks very helpful for robux game .
ethan81 · 14 weeks ago
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seofox · 1 week and 3 days ago

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