cmd

network

ip address

  • get subnet IP address

    $ ip addr show eno1 | grep inet | awk '{ print $2; }' | sed 's/\/.*$//'
192.168.1.105
fe80::e5ca:1027:b572:9998

  • get public IP address

    $ curl -4 icanhazip.com
182.150.46.248

check port

$ sudo lsof -i:1111
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
ss-server 903 nobody    8u  IPv4  20522      0t0  UDP *:1111
obfs-serv 909   root    7u  IPv4  20649      0t0  TCP *:1111 (LISTEN)

$ sudo netstatus -tunpla | grep 1111
tcp        0      0 0.0.0.0:1111            0.0.0.0:*               LISTEN      909/obfs-server
udp        0      0 0.0.0.0:1111            0.0.0.0:*                           903/ss-server

  • list all ports

    $ lsof -i
# or stop by ctrl-c
$ lsof -i -r

# or: https://www.commandlinefu.com/commands/view/2545/list-programs-with-open-ports-and-connections
$ netstat -ntauple

  • show apps that use internet connection

    $ lsof -P -i -n
$ lsof -P -i -n | cut -f 1 -d " " | uniq | tail -n +2

# or : https://www.commandlinefu.com/commands/view/3546/show-apps-that-use-internet-connection-at-the-moment.-multi-language
$ ss -p
$ ss -p | cut -f2 -sd\"

file

check file text or binary

[!NOTE|label:references:]

$ find . -type f -print0 | perl -0nE 'say if -f and -s _ and -T _'

# verify
$ find . -type f -print0 | perl -0nE 'say if -f and -s _ and -T _' | grep -a -E '\.db$'

system

clock/time/date

[!TIP|lavel:see also:]

download

  • parallel file downloading with wget

    $ wget -nv http://en.wikipedia.org/wiki/Linux -O- | egrep -o "http://[^[:space:]]*.jpg" | xargs -P 10 -r -n 1 wget -nv

  • log download speed

    $ echo $(date +%s) > start-time; URL=http://www.google.com; while true; do echo $(curl -L --w %{speed_download} -o/dev/null -s $URL) >> bps; sleep 10; done &

# show as graph view
$ gnuplot -persist <(echo "plot 'bps' with lines")

  • download every font from dafont.com to current folder

    $ d="www.dafont.com/alpha.php?"; for c in {a..z}; do l=`curl -s "${d}lettre=${c}"|sed -n 's/.*ge=\([0-9]\{2\}\).*/\1/p'`; for((p=1;p<=l;p++));do for u in `curl -s "${d}page=${p}&lettre=${c}"|egrep -o "http\S*.com/dl/\?f=\w*"`; do aria2c "${u}"; done; done; done

  • download free e-books

    $ wget -erobots=off --user-agent="Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.3) Gecko/2008092416 Firefox/3.0.3" -H -r -l2 --max-redirect=1 -w 5 --random-wait -PmyBooksFolder -nd --no-parent -A.pdf http://URL

backup

  • database backup

    $ backup() { for i in "$@"; do cp -va $i $i.$(date +%Y%m%d-%H%M%S); done }

  • backup mysql

    $ for I in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $I | gzip > "$I.sql.gz"; done

  • backup multiple files

    $ cp -bfS.bak filename filename

others

  • advanced ls

    $ find $PWD -maxdepth 1 -printf '%.5m %10M %#9u:%-9g %#5U:%-5G [%AD | %TD | %CD] [%Y] %p\n'

# or
$ find $PWD -maxdepth 1 -printf '%.5m %10M %#9u:%-9g %#5U:%-5G [%AD | %TD | %CD] [%Y] %p\n' | sort -rgbS 50%

  • DOS tree

    $ find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g':wa
.
|____a_b
|____b_a

  • the most frequent used words of a text file

    $ cat WAR_AND_PEACE_By_LeoTolstoi.txt | tr -cs "[:alnum:]" "\n"| tr "[:lower:]" "[:upper:]" | awk '{h[$1]++}END{for (i in h){print h[i]" "i}}'|sort -nr | cat -n | head -n 30

  • count how many times a string appears in a (source code) tree

    $ grep -or string path/ | wc -l

  • matrix

    $ echo -e "\e[32m"; while :; do for i in {1..16}; do r=`echo -e "\x$(echo $(($(($RANDOM % 26)) + $(echo $([[ $(($RANDOM % 3)) == 1 ]] && echo -n 48 || echo -n $([[ $(($RANDOM % 3)) == 2 ]] && echo -n 97 || echo -n 65))))) 16 o p | dc)"`; if [[ $(($RANDOM % 5)) == 1 ]]; then if [[ $(($RANDOM % 4)) == 1 ]]; then v+="\e[1m $r   "; else v+="\e[2m $r   "; fi; else v+="     "; fi; done; echo -e "$v"; v=""; done

# https://www.commandlinefu.com/commands/view/2531/matrix-style
$ tr -c "[:digit:]" " " < /dev/urandom | dd cbs=$COLUMNS conv=unblock | GREP_COLOR="1;32" grep --color "[^ ]"

# https://www.commandlinefu.com/commands/view/3652/matrix-style
$ echo -e "\e[32m"; while :; do for i in {1..16}; do r="$(($RANDOM % 2))"; if [[ $(($RANDOM % 5)) == 1 ]]; then if [[ $(($RANDOM % 4)) == 1 ]]; then v+="\e[1m $r "; else v+="\e[2m $r "; fi; else v+=" "; fi; done; echo -e "$v"; v=""; done

# https://www.commandlinefu.com/commands/view/4352/another-matrix-style-implementation
$ COL=$(( $(tput cols) / 2 )); clear; tput setaf 2; while :; do tput cup $((RANDOM%COL)) $((RANDOM%COL)); printf "%$((RANDOM%COL))s" $((RANDOM%2)); done

# https://www.commandlinefu.com/commands/view/2542/matrix-style
$ LC_ALL=C tr -c "[:digit:]" " " < /dev/urandom | dd cbs=$COLUMNS conv=unblock | GREP_COLOR="1;32" grep --color "[^ ]"

# https://www.commandlinefu.com/commands/view/4384/another-matrix-style-implementation
$ echo -ne "\e[32m" ; while true ; do echo -ne "\e[$(($RANDOM % 2 + 1))m" ; tr -c "[:print:]" " " < /dev/urandom | dd count=1 bs=50 2> /dev/null ; done

# https://www.commandlinefu.com/commands/view/2615/matrix-style
$ echo -e "\e[31m"; while $t; do for i in `seq 1 30`;do r="$[($RANDOM % 2)]";h="$[($RANDOM % 4)]";if [ $h -eq 1 ]; then v="\e[1m $r";else v="\e[2m $r";fi;v2="$v2 $v";done;echo -e $v2;v2="";done;

  • notify send in Gnome

    $ notify-send ["<title>"] "<body>"

  • notify via inotifywait

    $ inotifywait -mrq -e CREATE --format %w%f /path/to/dir | while read FILE; do chmod g=u "$FILE"; done

  • change xterm window title

    $ echo "^[]0;My_Title_Goes _Here^G"

  • retry previous cmd until succeed

    $ until !!; do :; done

# or: https://www.commandlinefu.com/commands/view/12238/retry-the-previous-command-until-it-exits-successfully
$ until !!; do done

# or: https://www.commandlinefu.com/commands/view/12236/retry-the-previous-command-until-it-exits-successfully
$ !!; while [ $? -ne 0 ]; do !!; done

  • retry until succeed

    $ util <command>; do echo "retyring"; sleep 1; done

  • check unread Gmail from the command line

    $ curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | sed -n "s/<title>\(.*\)<\/title.*name>\(.*\)<\/name>.*/\2 - \1/p"

# from mac:
$ curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | perl -pe 's/^<title>(.*)<\/title>.*<name>(.*)<\/name>.*$/$2 - $1/'

# or: https://www.commandlinefu.com/commands/view/9490/check-your-unread-gmail-from-the-command-line
$ curl -u username --silent "https://mail.google.com/mail/feed/atom" | awk 'BEGIN{FS="\n";RS="(</entry>\n)?<entry>"}NR!=1{print "\033[1;31m"$9"\033[0;32m ("$10")\033[0m:\t\033[1;33m"$2"\033[0m"}' | sed -e 's,<[^>]*>,,g' | column -t -s $'\t'

  • search cmdful via curl

    $ cmdfu(){ curl "http://www.commandlinefu.com/commands/matching/$@/$(echo -n $@ | openssl base64)/plaintext"; }

# or: https://www.commandlinefu.com/commands/view/10233/search-commandlinefu.com-from-the-command-line-using-the-api
# usage: cmdfu search 'command'
$ cmdfu(){ curl "http://www.commandlinefu.com/commands/matching/$(echo "$@" | sed 's/ /-/g')/$(echo -n $@ | base64)/plaintext" --silent | vim -R - }

# or: https://www.commandlinefu.com/commands/view/9654/search-commandlinefu.com-from-the-command-line-using-the-api
$ cmdfu(){ curl "http://www.commandlinefu.com/commands/matching/$@/$(echo -n $@ | openssl base64)/plaintext" --silent | sed "s/\(^#.*\)/\x1b[32m\1\x1b[0m/g" | less -R }

  • backup cmdfu commands

    # usage: clfavs username password num_favourite_commands /path/to/file
$ clfavs(){ URL="http://www.commandlinefu.com"; wget -O - --save-cookies c --post-data "username=$1&password=$2&submit=Let+me+in" $URL/users/signin; for i in `seq 0 25 $3`; do wget -O - --load-cookies c $URL/commands/favourites/plaintext/$i >>$4; done; rm -f c; }
# or
$ clfavs(){ URL="http://www.commandlinefu.com"; wget -O - --save-cookies c --post-data "openid=$1&submit=Let+me+in" $URL/users/openid; for i in `seq 0 25 $3`; do wget -O - --load-cookies c $URL/commands/favourites/plaintext/$i >>$4; done; rm -f c; }
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