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 17:09:09 996
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.
108

pushd /tmp

ruedu · 2009-02-16 16:52:59 1084
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 1054
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 1025

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premiumize - create a ddl & save the URL in variable MYLINK

Print a row of characters across the terminal

Pure Bash This will print a row of characters the width of the screen without using any external executables. In some cases, COLUMNS may not be set. Here is an alternative that uses tput to generate a default if that's the case. And it still avoids using tr. $ printf -v row "%${COLUMNS:-$(tput cols)}s"; echo ${row// /#} The only disadvantage to either one is that they create a variable.

Unaccent an entire directory tree with files.

This command changes all filename and directories within a directory tree to unaccented ones. I had to do this to 'sanitize' some samba-exported trees. The reason it works might seem a little difficult to see at first - it first reverses-sort by pathname length, then it renames only the basename of the path. This way it'll always go in the right order to rename everything. Some notes: 1. You'll have to have the 'unaccent' command. On Ubuntu, just aptitude install unaccent. 2. In this case, the encoding of the tree was UTF-8 - but you might be using another one, just adjust the command to your encoding. 3. The program might spit a few harmless errors saying the files are the same - not to fear.

mtr, better than traceroute and ping combined

mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool. As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME. by sending packets with purposly low TTLs. It continues to send packets with low TTL, noting the response time of the intervening routers. This allows mtr to print the response percentage and response times of the internet route to HOSTNAME. A sudden increase in packetloss or response time is often an indication of a bad (or simply over‐loaded) link.

tar.gz with gpg-encryption on the fly

Create a encrypted tar.gz file from a directory on the fly. The encryption is done by GPG with a public key. The resulting filename is tagged with the date of creation. Very usefull for encrypted snapshots of folders.

Print number of mb of free ram

Create .pdf from .doc

sudo apt-get install cups-pdf

Compare two directory trees.

Perform a C-style loop in Bash.

Print 0 through 99, each on a separate line.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Stay in the loop…

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