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Command to rename multiple file in one go

Mirror a directory structure from websites with an Apache-generated file indexes
wget/curl/friends are not good with mirroring files off websites, especially those with Apache-generated directory listings. These tools endlessly waste time downloading useless index HTML pages. lftp's mirror command does a better job without the mess.

command shell generate random strong password
shell generate random strong password

memcache affinity: queries local memcached for stats, calculates hit/get ratio and prints it out.
queries local memcached for stats, calculates hit/get ratio and prints it out.

Converts uppercase chars in a string to lowercase
Another alternative is to define a function: lower() { echo ${@,,} } lower StrinG

grep for minus (-) sign
Use flag "--" to stop switch parsing

get cookies from firefox
useful to use after with the --load-cookies option of wget

Assign function keys to your frequent commands
This is a common use of bind. Hitting any key after will output the key's character sequence. This makes possible using it into a bind command. So pressing ctrl+v and then F2 will output "^[[12~", once binded every time you'll press the function key F2 it will execute your command. Added the \n to make it execute it as well.

do something else while waiting for an event, such as reboot
until (ssh root@10.1.1.39 2> /dev/null); do date; sleep 15; done In this case will execute "date" then "sleep 15" until we are able to ssh into server, such as after a reboot Could also be like: until ( ping 10.1.1.39 1> /dev/null); do echo "server 10.1.1.39 is down"; sleep 15; done

Detect encoding of a text file
This command gives you the charset of a text file, which would be handy if you have no idea of the encoding.


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