Заморозить обновления пакета php5-cgi в Linux
# echo php5-cgi hold | dpkg —set-selections
# echo php5-cgi hold | dpkg —set-selections
${string//regsubstring/replacement}
$ time for i in {1..100000} ; do echo $i $>/dev/null ; done
$ sed ‘s/string1/string2/g’
$ sed -e ‘:a;/^$/N;/\n$/{D;ba}’ file.txt
$ echo one two one three one one