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set bash not to show the vim content after exit

User1 is using TERM=xterm, in this case when you exit vim it will clear the terminal. User2 is using TERM=vt100, in this case when you exit vim it will not clear the terminal.

Terminal color and format

edit ~/.bashrc PS1='[\033[1;32;1m]\u:\W \t$[\033[1;37;1m] '

ack

ack image_tag --ignore-file=ext:out --ignore-dir=build64_debug
ack image_tag --ignore-file='match:/tags|cscope.*/' --ignore-dir=build64_release

grep

grep -C 3 "match_pattern" file_name --color=auto

find files according to time

find . -type f -atime +7
find . -type f -amin -10

time stamp conversion

date +%s
date -d '2017-1-4 17:08' +%s
date -d @1483520880
date -d @1483520880 +"%Y-%m-%d %H:%M:%S"

cscope ctags

find . -regex ".*.(h|cpp|cc)" > cscope.files cscope -bkq -i cscope.files ctags -L cscope.files usage for ctag :tag {ident} "jump to ident tag :tags "show tag stack :ts "show all tags found :tp "show previous tag :tn "show next tags shortcut Ctrl+t "return the last place Ctrl+] "jump to the tag place

shell for loop

for i in 1 2 3; do echo $i; done;
for i in {1..3}; do echo $i; done;
for i in $(seq 1 3 10); do echo $i; done
for ((i=1;i<10;i++)); do echo $i; done;

install software on ubuntu

sudo apt-get install sudo apt-get install
sudo dpkg -i packagename.deb

eg. Kill CLOSE_WAIT connections by IP

$ netstat -anp | grep 192.168.0.100 | grep CLOSE_WAIT | awk '{print $7}' | cut -d \/ -f1 | grep -oE "[[:digit:]]{1,}" | xargs kill or

$ netstat -anp |\  # print network connections
grep 192.168.0.100 |\  # established with IP 192.168.0.100
grep ':80 ' |\  # established on port 80
grep CLOSE_WAIT |\  #  connections in CLOSE_WAIT state
awk '{print $7}' |\  #  print the 7th column
cut -d \/ -f1 |\  #  extract PIDs
grep -oE "[[:digit:]]{1,}" |\  #  extract PIDs
xargs kill  #  kill PIDs