Category: OS

#file extension for f in *; do fn=”${f%.*}”;echo “fn=$fn,f=$f”; done;

tr ‘[A-Z]’ ‘[a-z]’ # to lower case sed ‘s/]]/]/g’ # replace ]] with ] awk ‘{print tolower($0)}’ # change whole string to lower sed ‘s/^[0-9]*//g’ # replace all numbers with nothing

Copy Data to multiple machines for i in 187 135; do echo “–server${i}–“; scp -p -r /dev/mydata myuser@myhost${i}.net:/dev ; done Execute Scripts in multiple machines Example 1 for i in 187 135; do echo “–server${i}–“; ssh myuser@myhost${i}.net “chmod 777 /dev/mydata.sh;rm -r /dev/main;” ; done Example 2 for i in 187 135; do echo “——de${i}——–“; ssh…

String Replacement :1,$/s/String1/String2/g Yanking y9y (with : ) -> kopies current and next 9 lines p -> pastes the kopied mentioned lines Yanking using vi – adding files together – copy 30000 lines 30000 yy yy30000 The Yank Command yy make a copy of the current line and place it in the General Purpose Buffer…

lsof -i lsof -i | less # firefox example lsof -i | grep firefox check every second while [ “1” ] ; do clear; lsof -i; sleep 1; done; # firefox example while [ “1” ] ; do clear; lsof -i | grep firefox; sleep 1; done; netstat |grep localhost while [ “1” ] ;…

less +F $(date “+/var/logs/vmware_%F.log”)

du – file space usage GB sized files and directories du -xh DIRPATH |egrep “^[0-9\.]+[GT]\s” # Examples du -xh ~/ |egrep “^[0-9\.]+[GT]\s” sudo du -xh / |egrep “^[0-9\.]+[GT]\s” Size Of Directory and Disk Space du -s .archived/ du –sk # k: output in in KB # x=> expands, only on the local file system –…