Commands by stinkerweed999

Commands by stinkerweed999 (10)

sorted by

Trim disk image for best compression before distributing

fstrim is usually used on SSDs but can also be used to remove useless bits from file system images. This is most helpful if the compressed disk image is intended to be distributed, since it will be smaller than an untrimmed compressed image. Show Sample Output
This is sample output - yours may be different.
```
disk/: 1.1 GiB (1185869824 bytes) trimmed
```
0

kpartx -av disk.img && mkdir disk && mount /dev/mapper/loop0p1 disk && fstrim -v disk && umount disk && kpartx -d disk.img

stinkerweed999 · 2019-07-16 23:54:13 1619
Manually trim SSD

Trims left over file system data from SSD. This can be set as a mount option, but then IO performance decreases. I prefer to trim in a batch either on boot or every few weeks. Show Sample Output
This is sample output - yours may be different.
```
/: 372 GiB (399476387840 bytes) trimmed
```
0

sudo fstrim -v /

stinkerweed999 · 2019-07-16 23:41:56 39
Grep live log tailing, tracks file open/close

"-F" will continue tailing if file is closed and another file opened with same name. This is handy for tailing log files that segment while watching them without having to issue the command again.
This is sample output - yours may be different.
0

tail -F some_log_file.log | grep the_thing_i_want

stinkerweed999 · 2018-01-23 23:21:23 24
Better git diff, word delimited and colorized

I've been using colordiff for years. wdiff is the new fav, except its colors. Word delimited diffs are more interleaved, easing the chore of associating big blocks of changes.
This is sample output - yours may be different.
2

git diff -U10 |wdiff --diff-input -a -n -w $'\e[1;91m' -x $'\e[0m' -y $'\e[1;94m' -z $'\e[0m' |less -R

stinkerweed999 · 2012-08-15 01:42:16 5
Auto download Ubuntu 10.04 LTS with super fast zsync

Need to have rc iso pre-downloaded before running command.
This is sample output - yours may be different.
4

mv ubuntu-10.04-rc-desktop-amd64.iso ubuntu-10.04-desktop-amd64.iso; i=http://releases.ubuntu.com/10.04/ubuntu-10.04-desktop-amd64.iso.zsync; while true; do if wget $i; then zsync $i; date; break; else sleep 30; fi; done

stinkerweed999 · 2010-04-29 15:49:43 4
Split huge file into DVD+R size chunks for burning

Real DVD+R size is 4700372992 bytes, but I round down a little to be safe. To reconstitute use cat. "cat file.img.gz.aa file.img.gz.ab ..... > file.img.gz" Show Sample Output
This is sample output - yours may be different.
```
file.img.gz.aa
file.img.gz.ab
file.img.gz.ac
.
.
.
```
1

split -b 4700000000 file.img.gz file.img.gz.

stinkerweed999 · 2010-03-18 15:42:27 4
Recursively grep for string and format output for vi(m)

This is a big time saver for me. I often grep source code and need to edit the findings. A single highlight of the mouse and middle mouse click (in gnome terminal) and I'm editing the exact line I just found. The color highlighting helps interpret the data.
This is sample output - yours may be different.
2

mgc() { grep --exclude=cscope* --color=always -rni $1 . |perl -pi -e 's/:/ +/' |perl -pi -e 's/^(.+)$/vi $1/g' |perl -pi -e 's/:/ /'; }

stinkerweed999 · 2010-01-26 17:00:01 5
Recursively grep thorugh directory for string in file.

Print line numbers also, so you don't have to search through the files once its open for the string you already grepped for.
This is sample output - yours may be different.
2

grep -rni string dir

stinkerweed999 · 2010-01-26 16:34:06 4
Determine MAC address of remote host when you know its IP address

arping sends ARP requests to a neighboring host. This won't work if there is an ARP subnet gateway in the middle. If there is, you'll just get the gateway's MAC address not the host's address you are really trying to get to. Show Sample Output
This is sample output - yours may be different.
```
ARPING 192.168.1.2 from 192.168.1.3 eth0
Unicast reply from 192.168.1.2 [0B:DE:36:AF:C1:C8]  0.968ms
```
5

arping 192.168.1.2

stinkerweed999 · 2009-10-09 21:39:35 3
Download entire commandlinefu archive to single file

This is an extension of a previous command by satyavvd on 2009-07-23 12:04:02, but this one grabs the whole archive. Hard coded numbers in previous script capped number of commands that could be fetched. This one grabs them all regardless of how big the archive gets. Show Sample Output
This is sample output - yours may be different.
```
# SSH connection through host in the middle
ssh -t reachable_host ssh unreachable_host

# A fun thing to do with ram is actually open it up and take a peek. This command will show you all the string (plain text) values in ram
sudo dd if=/dev/mem | cat | strings

# Watch Star Wars via telnet
telnet towel.blinkenlights.nl

# Backticks are evil
echo "The date is: $(date +%D)"
```
0

for x in `jot - 0 \`curl "http://www.commandlinefu.com/commands/browse"|grep "Terminal - All commands" |perl -pe 's/.+(\d+),(\d+).+/$1$2/'|head -n1\` 25`; do curl "http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/$x" ; done >a.txt

stinkerweed999 · 2009-08-25 21:57:15 6

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

rsync directory tree including only files that match a certain find result.

'-mtime -10' syncs only files newer 10 days (-mtime is just one example, use whatever find expressions you need) printf %P: File's name with the name of the command line argument under which it was found removed. this way, you can use any src directory, no need to cd into your src directory first. using \\0 in printf and a corresponding --from0 in rsync ensures that even filenames with newline characters work (thanks syssyphus for #3808). both, #1481 and #3808 just work if you either copy the current directory (.) , or the filesystem root (/), otherwise the output from find and the source dir from rsync just don't match. #7685 works with an arbitrary source directory.

get total of inodes of root partition

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Convert decimal numbers to binary

Convert some decimal numbers to binary numbers. You could also build a general base-converter: $ function convBase { echo "ibase=$1; obase=$2; $3" | bc; } then you could write $ function decToBun { convBase 10 2 $1; }

Search for a string in all files recursively

Find name of package which installed a given shell command

Some command names are very different from the name of the package that installed them. Sometimes, you may want to find out the name of the package that provided a command on a system, so that you can install it on another system.

Sprunge.us - CLI alternative to PasteBin.com

NAME sprunge: command line pastebin: SYNOPSIS | curl -F 'sprunge=

graphical memory usage

smem is very clever, it keeps in mind shared memory in its calculations!!! http://www.selenic.com/smem/

Get technical and tag information about a video or audio file

MediaInfo supplies technical and tag information about a video or audio file. (sudo apt install mediainfo)

Ensure that each machine that you log in to has its own history file

On systems where your home directory is shared across different machines, your bash history will be global, rather than being a separate history per machine. This setting in your .bashrc file will ensure that each machine has its own history file.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands by stinkerweed999