$ alias ltr ‘ls -altr’
Create an alias to list all contents of the current directory in “reverse” time order. Thus the last modified file will appear just above your next prompt. Useful for remembering where you left off modifying files in a folder o…
$ dd if=/dev/zero of=/dev/hda
Utiliza o dd para encher um HD de zeros com o arquivo /dev/zero, apagando todo o conte?do do disco.
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by David Winterbottom…
$ awk ‘sub("$", "\r")’ unixfile.txt > winfile.txt
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by David Winterbottom (codeinthehole.com)
$ mysql -uUser -pPassword -N -s -r -e ‘SHOW PROCESSLIST’ | grep -cv "SHOW PROCESSLIST"
Counts Mysql Threads
mysql switches
-N skip column names (remove headers)
-s silent mode (removes separator chars)
-r raw output
-e execute
grep switches
-…
$ ff() { local IFS=’|'; grep -rinE "$*" . ; }
Grep will read the contents of each file in PWD and will use the REs $1 $2 … $n to match the contents.
In case of match, grep will print the appropriate file, line number and the matching line.
…
$ sync && echo 1 > /proc/sys/vm/drop_caches
run sync first to flush useful things out to disk!!!
To free pagecache:
echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
echo 2 > /proc/sys/vm/drop_caches
To free pagecache, d…
$ :bufdo %s/foo/bar/ge | up
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View all commands by unixmonkey21861
by David Winterbottom (codeinthehole.com)
$ grep -E ‘string-1|string-2|regexp-1|regexp-n’ <filename>
In the sample output:
The first 4 lines of the grep output are the result of the first matchstring/regexp (pts),
next 4 lines are the result of the second matchstring/regexp (tty).. so…
$ tar -caf some_dir.tar.xz some_dir
the -a flag causes tar to automatically pick the right compressor to filter the archive through, based on the file extension. e.g.
“tar -xaf archive.tar.xz” is equivalent to “tar -xJf archive.tar.xz”
“tar -xaf archiv…
$ wget -r -A .pdf -l 5 -nH –no-parent http://example.com
See man wget if you want linked files and not only those hosted on the website.
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by David Winterbott…
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