find . -name “*.txt” -print0 | xargs grep -H pattern

search for pattern in all txt files in current directory.

alias c-c=’xclip -sel clip’
alias c-v=’xclip -o -sel clip’

two aliases for copy to and from clipboard (like CTRL+C and CTRL+V shortcuts) you can use it:
cat file.txt | c-c or c-c file.txt
save clipboard in file.txt

function lines-from() {
sed -e “/$1/,\$b” -e ‘d’
}

function lines-between() {
sed -e “0,/$1/d” -e “/$2/,\$d”
}

two functions for (as names says) display lines between two patterns and lines begining from pattern.

find . -name Thumbs.db -print0 | xargs -0 rm

rm all Thumbs.db files (left from Windows) from current directory.

seq -s* 100 | bc

calculate factorial of 100 (100!)

convert numbers

echo “ibase=2;” | bc binary to octal

echo “obase=16;” | bc to hex

echo “obase=2;” | bc to binary

echo “obase=10;” | bc to dec

function wiki() { dig +short txt $1.wp.dg.cx; }

display wiki content via dns

function blue() {
echo -e “\x1b[34m\x1b[1m”$@”\x1b[0m”;
}

display arguments in blue

function green() {
echo -e “\x1b[32m\x1b[1m”$@”\x1b[0m”;
}

display arguments in green

function red() {
echo -e “\x1b[31m\x1b[1m”$@”\x1b[0m”;
}

display arguments in red

function md5check() {
test `md5sum $2 | cut -d’ ‘ -f1` = “$1″ && green pass || red fail
}

function check if filename (first argument) has md5 hash (second argument)

md5check e68a6f2183d441c9ab6d59d8c2eb5ad5

function who-use() {
lsof “$1″ | grep -v COMMAND | cut -d’ ‘ -f1;
}

display processes which use particular file

function msg {
zenity –info –title=”$1″ –text=”$2″;
}

display GUI message box

function input {
zenity –entry –title=”$1″;
}

display GUI prompt with input box