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Commands tagged Linux from sorted by
Terminal - Commands tagged Linux - 221 results
psql -h <SERVER NAME HERE> -c 'SELECT version();' | grep -v 'version\|---\|row\|^ *$' | sed 's/^\s*//'
2014-03-17 18:36:40
User: pnelsonsr
Functions: grep sed
0

In a multiple PostgreSQL server environment knowing the servers version can be important. Note that psql --version returns just the local psql apps version which may not be what you want. This command dumps the PostgreSQL servers version out to one line. You may need to add more command line options to the psql command for your connection environment.

for i in `sudo /sbin/fdisk -l |grep Disk |grep dev |awk '{ print $2 }' |sed s/://g` ; do sudo /usr/bin/dd if=/dev/urandom of=$i bs=8M & done
2014-03-16 12:04:59
User: aimana007
Functions: awk grep sed sudo
Tags: bash Linux
0

This command will use the fdisk utility to find all block devices on your system, and overwrite them with data from the /dev/urandom non-blocking random number generator.

CAUTION: This will irrevocably erase EVERY SINGLE physical block storage device visible to the fdisk utility, including plugged USB devices, RAID sets, LVM, etc.

eval $(history | cut -c 8- | grep "adb connect [0-9]" | tail -1)
2014-02-27 14:44:27
User: CanOrhan
Functions: cut eval grep tail
0

Connects to the last adb connection in history.

ssh -NL 12345:localhost:631 username@remote_server
find /logdir -type f -mtime +7 -print0 | xargs -0 -n 1 nice -n 20 bzip2 -9
date -u `ssh user@remotehost date -u '+%m%d%H%M%Y.%S'`
2014-02-10 03:11:14
User: scruss
Functions: date
0

Useful if localhost is a small machine running BusyBox, which uses a slightly unusual format to set the date. Remotehost can be pretty much any Linux machine, including one running BusyBox. Uses UTC for portability.

rsync -a -v --delete sending_directory target_directory
find * -regextype posix-extended -regex '.*\.(ext_1|ext_2)' -exec cp {} copy_target_directory \;
grep -v rootfs /proc/mounts > /etc/mtab
% sudo yum remove streams-$(uname-r)
nc -kl 5432 -c 'echo -e "HTTP/1.1 200 OK\r\n$(date)\r\n\r\n";echo "<p>How are you today?</p>"'
2013-11-12 14:00:11
User: gvitalie
Functions: echo
-1

-k, --keep-open will keep connection alive, and we could exclude using 'while true'

nc is such a powerful command, it could be used instead of any OS! :p

dd bs=1M if=/dev/scd0 of=./filename.iso OR readom -v dev='D:' f='./filename.iso' speed=2 retries=8
2013-10-23 15:53:27
User: scotharkins
Functions: dd
0

This example is taken from Cygwin running on Win7Ent-64. Device names will vary by platform.

Both commands resulted in identical files per the output of md5sum, and ran in the same time down to the second (2m45s), less than 100ms apart. I timed the commands with 'time', which added before 'dd' or 'readom' gives execution times after the command completes. See 'man time' for more info...it can be found on any Unix or Linux newer than 1973. Yeah, that means everywhere.

readom is supposed to guarantee good reads, and does support flags for bypassing bad blocks where dd will either fail or hang.

readom's verbosity gave more interesting output than dd.

On Cygwin, my attempt with 'readom' from the first answer actually ended up reading my hard drive. Both attempts got to 5GB before I killed them, seeing as that is past any CD or standard DVD.

dd:

'bs=1M' says "read 1MB into RAM from source, then write that 1MB to output. I also tested 10MB, which shaved the time down to 2m42s.

'if=/dev/scd0' selects Cygwin's representation of the first CD-ROM drive.

'of=./filename.iso' simply means "create filename.iso in the current directory."

readom:

'-v' says "be a little noisy (verbose)." The man page implies more verbosity with more 'v's, e.g. -vvv.

dev='D:' in Cygwin explicitly specifies the D-drive. I tried other entries, like '/dev/scd0' and '2,0', but both read from my hard drive instead of the CD-ROM. I imagine my LUN-foo (2,0) was off for my system, but on Cygwin 'D:' sort of "cut to the chase" and did the job.

f='./filename.iso' specifies the output file.

speed=2 simply sets the speed at which the CD is read. I also tried 4, which ran the exact same 2m45s.

retries=8 simply means try reading a block up to 8 times before giving up. This is useful for damaged media (scratches, glue lines, etc.), allowing you to automatically "get everything that can be copied" so you at least have most of the data.

tar -zcvf archive_name.tar.gz directory_to_compress
rsync -arvx --numeric-ids --stats --progress --bwlimit=1000 file server:destination_directory
2013-10-01 13:00:59
Functions: file rsync
Tags: Linux rsync
0

Useful for transferring large file over a network during operational hours

wbinfo -a username%password
echo 0$(awk '/Pss/ {printf "+"$2}' /proc/$PID/smaps)|bc
2013-09-26 18:20:22
User: atoponce
Functions: awk echo
Tags: Linux awk echo bc proc
5

The "proportional set size" is probably the closest representation of how much active memory a process is using in the Linux virtual memory stack. This number should also closely represent the %mem found in ps(1), htop(1), and other utilities.

echo "This is the message body" | mutt -s "Message subject" -a file_to_attach.zip fred@example.com
2013-09-26 08:05:26
User: jedifu
Functions: echo
Tags: Linux shell email
1

This uses mutt to send the file, and doesn't require uuencode etc

for f in ./*.xls; do mv "$f" "${f%.*}.ods"; done
2013-09-17 01:41:56
User: evilsoup
Functions: mv
Tags: bash Linux
3

An entirely shell-based solution (should work on any bourne-style shell), more portable on relying on the rename command, the exact nature of which varies from distro to distro.

rename 's/.xls/.ods/g' *.xls
for I in $(awk -v LIMIT=500 -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd | cut -f 1-1 -d ':' | xargs); do usermod -g YOURGROUP $I ; done
hciconfig;hciconfig -a hci0;lsmod |grep bt;dmesg | grep tooth
diff <(sort <(md5deep -b -r /directory/1/) ) <(sort <(md5deep -b -r /directory/2/)
2013-08-19 18:20:49
Functions: diff sort
Tags: bash Linux diff
0

Compares the md5 checksums of the contents of two directories, outputting the checksum and filename where any files differ. Shows only the file name, not the full path.

diff <(sort <(md5deep -r /directory/1/) |cut -f1 -d' ') <(sort <(md5deep -r /directory/2/) |cut -f1 -d' ')
2013-08-18 22:13:07
Functions: cut diff sort
Tags: bash Linux diff
0

Compute the md5 checksums for the contents of two mirrored directories, then sort and diff the results. If everything matches, nothing is returned. Otherwise, any checksums which do not match, or which exist in one tree but not the other, are returned. As you might imagine, the output is useful only if no errors are found, because only the checksums, not filenames, are returned. I hope to address this, or that someone else will!

wget -qO - http://www.asciiartfarts.com/random.cgi | sed -n '/<pre>/,/<\/pre>/p' | sed -n '/<table*/,/<\/table>/p' | sed '1d' | sed '$d' | recode html..ascii
for i in '/tmp/file 1.txt' '/tmp/file 2.jpg'; do ln -s "$i" "$i LINK"; done
2013-08-02 08:30:50
User: qwertyroot
Functions: ln
0

Replace

'/tmp/file 1.txt' '/tmp/file 2.jpg'

with

"$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS"

for Nautilus script

Or with

%F

for Thunar action

If you linking the symlinks itself, but want to link to source files instead of symlinks, use

"`readlink -m "$i"`"

instead of

"$i"

like this:

for i in '/tmp/file 1.txt' '/tmp/file 2.jpg'; do ln -s "`readlink -m "$i"`" "$i LINK"; done

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~