Szkriptelés

awk '!x[$0]++'

sed -i '/^EZENSTRINGUTAN /{N; /\nBEILLESZTENDO$/b; s/\n/\nBEILLESZTENDO\n/}' /etc/resolv.conf

zip -9rv ${LOG}/$(date +%Y%m)_archived_backup_logs.zip ${LOG}/${LOGFILE##*/}
find ${LOG}/*.log -type f -mtime +60 -exec rm {} \;

case $(ps -o stat= -p $$) in
*+*) echo "Running in foreground" ;;
*) echo "Running in background" ;;
esac

CRON=$(pstree -s $$ | grep -q cron && echo true || echo false)

if egrep -q "SigIgn:\s.{15}[13579bdf]" /proc/$$/status ; then
  echo "Ignores SIGHUP (runing via nohup)" 
else
  echo "Doesn't ignore SIGHUP (NOT running via nohup)"                                             
fi

Pl: 4 oszlopos bemeneti fájl 3 soros csoportokban. A 3 sort egymás után rakjuk, lerendezzük az 5. oszlopra, majd újra eltördeljük

paste - - - < input.file | sort -k5 | xargs -n4

A_CURR_SHELL=$(ps -o args= -p "$$" | sed 's/ .*$//' | sed 's#^.*\/##g')
if [[ "$A_CURR_SHELL" == "bash" ]]; then
    exec > >(tee -ia $A_TMP_FILE)
    exec 2> >(tee -ia $A_TMP_FILE >&2)
elif [[ "$A_CURR_SHELL" == "ksh" ]]; then
    mkfifo /tmp/$$-out-fifo
    ( exec tee -ia $A_TMP_FILE < /tmp/$$-out-fifo >&2 ) &
    exec 1>/tmp/$$-out-fifo
    exec 2>/tmp/$$-out-fifo
    rm -f /tmp/$$-out-fifo
fi

forrás https://stackoverflow.com/questions/3173131/redirect-copy-of-stdout-to-log-file-from-within-bash-script-itself

cat file | sed 's/([^(]*)$/,&/' | awk -F'[,]' '{a[$2]++}END{for(k in a) print $1,k,$3,"("a[k]"x)"}'

DEFAULT="Semmit"
read -e -p "Mit akarsz?" -i "$DEFAULT" VALTOZO
VALTOZO="${VALTOZO:-$DEFAULT}"

read input </dev/tty

[ ! -t 0 ]

sed -n '/Storage Slots/{:a;N;/\n$/!ba;p}' 
awk 'BEGIN{IGNORECASE=1;RS=ORS="\n\n";FS=OFS="\n"}/Storage Slots/'
perl -00 -ne 'print if /Storage Slots/'

awk -v RS= -v ORS='\n\n' 'NR==FNR{a[$0]++;next}!($0 in a)' file2 file1

ssh -n ...

Pl:

$((10#`date +%H`))

perl -lne '/reguláris kifejezés/ && print $&'

xargs -0 -L1 -a /proc/3242/environ

forrás: http://tldp.org/LDP/abs/html/parameter-substitution.html

ANSI2HTML https://github.com/pixelb/scripts/blob/master/scripts/ansi2html.sh Színkódok https://misc.flogisoft.com/bash/tip_colors_and_formatting

Hiba csatorna színezése:

 $ parancs 2> >(while read line; do echo -e "\e[01;31m$line\e[0m"; done)

Bash színkódok törlése szövegből:

sed -r "s/\x1B(\[[0-9;]*[JKmsu]|\(B)//g"

Színkódok és sorvég karakterek kivágása szövegből: A ^M-et így: CTRL+V, CTRL+M !!

sed -i -e 's/\x1b\[[0-9;]*m//g' -e 's/^M//g' file

Váltott soroz színezés:

| awk '{if (NR%2 != 1) {print "\033[48;5;235m" $0 "\033[0m"; next;} {print "\033[38;5;239m" $0 "\033[0m";}}'

export PS1='[\u@\h \W] \D{%F %T}\n\$ '

env printf '\u2502'

Karakterek: https://en.wikipedia.org/wiki/Box-drawing_character

- Position the Cursor:

\033[<L>;<C>H
   Or
\033[<L>;<C>f
puts the cursor at line L and column C.

- Move the cursor up N lines:

\033[<N>A

- Move the cursor down N lines:

\033[<N>B

- Move the cursor forward N columns:

\033[<N>C

- Move the cursor backward N columns:

\033[<N>D

- Clear the screen, move to (0,0):

\033[2J

- Erase to end of line:

\033[K

- Save cursor position:

\033[s

- Restore cursor position:

\033[u

v1:

a=1
sp="/-\|"
echo -n ' '
while true
do
    printf "\b${sp:a++%${#sp}:1}"
done

v2:

spinner()
{
    local pid=$1
    local delay=0.75
    local spinstr='|/-\'
    while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
        local temp=${spinstr#?}
        printf " [%c]  " "$spinstr"
        local spinstr=$temp${spinstr%"$temp"}
        sleep $delay
        printf "\b\b\b\b\b\b"
    done
    printf "    \b\b\b\b"
}

Új shellben:

(parancs1)

Aktuális shellben:

{ parancs1; }

Bash scripting cheatsheet