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Dump HTTP header using wget
Let me suggest using wget for obtaining the HTTP header only as the last resort because it generates considerable textual overhead. The first ellipsis of the sample output stands for Spider mode enabled. Check if remote file exists. --2009-03-31 20:42:46-- http://www.example.com/ Resolving www.example.com... 208.77.188.166 Connecting to www.example.com|208.77.188.166|:80... connected. HTTP request sent, awaiting response... and the second one looks for Length: 438 [text/html] Remote file exists and could contain further links, but recursion is disabled -- not retrieving.

Rename .JPG to .jpg recursively
This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension).

Watch the progress of 'dd'
need pv (pipe view) : http://www.ivarch.com/programs/pv.shtml

Install pip with Proxy
Installs pip packages defining a proxy

list files recursively by size

ls not pattern
Negative shell globs already come with bash. Make sure to turn on extended pattern matching with 'shopt -e extglob'.

FInd the 10 biggest files taking up disk space

Ergo browsing 'pacman' queries (Arch)
Alternative1 (grep support): pacman -Ss python | paste - - | grep --color=always -e '/python' | less -R Alternative2 (eye-candy, no grep): pacman --color=always -Ss "python" | paste - - | less -R in ~/.bashrc: pkg-grep() { pacman -Ss "$1" | paste - - | grep --color=always -e "${2:-$1}" | less -R ; } pkg-search() { pacman --color=always -Ss "python" | paste - - | less -R; }

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

1+2-3+4-5+6-7 Series


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