Commands by techie

Commands by techie (33)

sorted by

Delete lines in a text file fast

If you want to delete lines fast then all you need to do is vi/vim a text file, type in the amount of lines you want to delete (in my example I wanted to delete 10056 lines) followed by dd (no spaces). There will be no output so becareful with what number you type.
This is sample output - yours may be different.
-14

10056dd

techie · 2013-04-10 10:34:39 10
Turn off SE Linux

This will turn off SE Linux
This is sample output - yours may be different.
-5

setenforce 0

techie · 2013-04-05 15:38:05 1088
Reboot

Reboot
This is sample output - yours may be different.
-21

shutdown now -r

techie · 2013-04-05 15:28:55 13
Find out the permissions of the current directory

This will show you the permissions on the directory you are currently in
This is sample output - yours may be different.
-1

ls -lad

techie · 2013-04-03 09:58:31 6
Search google.com on your terminal

I found this command on a different site and thought you guy might enjoy it. Just change "YOURSEARCH" to what ever you want to search. Example, "Linux Commands"
This is sample output - yours may be different.
9

Q="YOURSEARCH"; GOOG_URL="http://www.google.com/search?q="; AGENT="Mozilla/4.0"; stream=$(curl -A "$AGENT" -skLm 10 "${GOOG_URL}\"${Q/\ /+}\"" | grep -oP '\/url\?q=.+?&amp' | sed 's/\/url?q=//;s/&amp//'); echo -e "${stream//\%/\x}"

techie · 2013-04-03 09:56:41 12
find established tcp connections without using netstat!!

Fast and easy way to find all established tcp connections without using the netstat command.
This is sample output - yours may be different.
2

lsof -i -n | grep ESTABLISHED

techie · 2013-04-03 09:14:09 8
Combo matrix

This is longer than others on here. The reason for this is I have combined two different matrix commands so it would work on all computers. I logged onto my server through a computer and it worked fine. I logged into my server through a mac and it looked $4!t so I have made one that works through both. Show Sample Output
This is sample output - yours may be different.
```
echo -e "\e[32m"; while :; do printf '%*c' $(($RANDOM % 30)) $(($RANDOM
% 2)); for i in {1..16}; do r=`echo -e "\x$(echo $(($(($RANDOM % 26)) + 
$(echo $([[ $(($RANDOM % 3)) == 1 ]] && echo -n 48 || echo -n $([[ 
$(($RANDOM % 3)) == 2 ]] && echo -n 97 || echo -n 65))))) 16 o p | 
dc)"`; if [[ $(($RANDOM % 5)) == 1 ]]; then if [[ $(($RANDOM % 4)) == 1  ]]; then v+="\e[1m $r   "; else v+="\e[2m $r   "; fi; else v+="     ";  fi; done; echo -e "$v"; v="";done
```
-1

echo -e "CHECK=SAMPLE" output --command_to_long

techie · 2013-04-03 08:46:47 10
Best command EVER!!

rsync is the best command ever and I am interested what the rest of you think is the best command
This is sample output - yours may be different.
-9

rsync

techie · 2013-03-01 14:47:19 5
< 1 2

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

Execute a command without saving it in the history

Yes, by correctly setting the HIST* variables you can make certain commands not saved in history. But that's complicated and easy to make a mistake. If you set HISTFILE= to blank, nothing in your current shell session will be saved in history. Although this is not a precise answer to the subject, but it's very simple.

Get all upgradable deb packages in a single line

Works for debian and ubuntu based distros.

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

List only directories, one per line

Alternatively, $ ls -F | grep /\$ but will break on directories containing newlines. Or the safe, POSIX sh way (but will miss dotfiles): $ for i in *; do test -d "./$i" && printf "%s\n" "$i"; done

Transform a portrait pdf in a landscape one with 2 pages per page

This is an example of the usage of pdfnup (you can find it in the 'pdfjam' package). With this command you can save ink/toner and paper (and thus trees!) when you print a pdf. This tools are very configurable, and you can make also 2x2, 3x2, 2x3 layouts, and more (the limit is your fantasy and the resolution of the printer :-) You must have installed pdfjam, pdflatex, and the LaTeX pdfpages package in your box.

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Convert all .flac from a folder subtree in 192Kb mp3

find . -type f -iname '*.flac' # searches from the current folder recursively for .flac audio files | # the output (a .flac audio files with relative path from ./ ) is piped to while read FILE; do FILENAME="${FILE%.*}"; flac -cd "$FILE" | lame -b 192 - "${FILENAME}.mp3"; done # for each line on the list: # FILE gets the file with .flac extension and relative path # FILENAME gets FILE without the .flac extension # run flac for that FILE with output piped to lame conversion to mp3 using 192Kb bitrate

Get all IPs via ifconfig

and, a lot uglier, with sed: $ ifconfig | sed -n '/inet addr:/s/[^:]\+:$\S\+$.*/\1/p' Edit: Wanted to be shorter than the perl version. Still think that the perl version is the best..

output length of longest line

If your wc does not have the -L option, you can use awk.

Stream YouTube URL directly to mplayer

The original doesn't work for me - but this does. I'm guessing that Youtube updated the video page so the original doesn't work.

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 techie