Commands by ruedu

Commands by ruedu (4)

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Let's say you have a web site

So you have a web site and you've plastered your significant other's name all over it. But you broke up with them and have some new love in your life. How do you find all those instances of their name and replace them?
This is sample output - yours may be different.
-1

for I in `find . -name "*.php"`; do sed -i "s/old name/new name/g" $I; done

ruedu · 2009-02-16 17:09:09 1
Push your present working directory to a stack that you can pop later

If are a Bash user and you are in a directory and need to go else where for a while but don't want to lose where you were, use pushd instead of cd. cd /home/complicated/path/.I/dont/want/to/forget pushd /tmp cd thing/in/tmp popd (returns you to /home/complicated/path/.I/dont/want/to/forget)
This is sample output - yours may be different.
100

pushd /tmp

ruedu · 2009-02-16 16:52:59 7
Backup all MySQL Databases to individual files

Backups all MySQL databases to individual files. Can be put into a script that grabs current date so you have per day backups.
This is sample output - yours may be different.
9

for I in `echo "show databases;" | mysql | grep -v Database`; do mysqldump $I > "$I.sql"; done

ruedu · 2009-02-16 16:41:05 0
Get your default route

This gets you your default route programatically, useful for scripts
This is sample output - yours may be different.
1

ip route | grep default | awk '{print $3}'

ruedu · 2009-02-16 16:29:03 0

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sort lines by length

making it "sound" more "natural" language like -- additionally sorting the longest words alphabetically: this approach is using: * to get at all lines of input * post-"for" structure * short-circuit-or in sort: if the lengths are the same, then sort alphabetically otherwise don't even evaluate the right hand side of the or * -C sets all input and ouput channels to utf8

Ultimate current directory usage command

An NCurses version of the famous old 'du' unix command

Recover resolution when a fullscreen program crashes and you're stuck with a tiny X resolution

This forces X back to its maximum resolution configured. To get a list, type `xrandr'.

Create a persistent connection to a machine

Create a persistent SSH connection to the host in the background. Combine this with settings in your ~/.ssh/config: Host host ControlPath ~/.ssh/master-%r@%h:%p ControlMaster no All the SSH connections to the machine will then go through the persisten SSH socket. This is very useful if you are using SSH to synchronize files (using rsync/sftp/cvs/svn) on a regular basis because it won't create a new socket each time to open an ssh connection.

One liner to kill a process when knowing only the port where the process is running

-k (kill option ) . To kill all processes accessing this port

Display laptop battery information

Find out how much data is waiting to be written to disk

Ever ask yourself "How much data would be lost if I pressed the reset button?" Scary, isn't it?

Show the number of current httpd processes

Displays the current time using HTTP

This command will show the current GMT time using HTTP. This might be useful if you just want to know what's the current human-readable and accurate-enough time, without changing the system time, using a simple command that would work regardless of the availability of NTP. Note: To get a quicker and more accurate response, replace google.com with your local NTP server. Also can be used as an alternative to the "htpdate" program: http://www.commandlinefu.com/commands/view/668/set-your-computers-clock-using-http-and-htp-http-time-protocol-when-ntpsntp-is-not-available

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

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