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GNU grep's PCRE(Perl-compatible regular expressions).
0grep -Po '^(.*?:\K)?.*' -
Delete the beginning of each line until first match of given character, in this case it's ":" Does it on all lines. The given character is deleted also, and can be a space.
0sed 's/^[^:]*://g' -
0convmv --lower --notest FILE
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1sysctl machdep.xcpm.cpu_thermal_level
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2ssh -J user@reachable_host user@unreacheable_host
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It finds, specifically, the connections to the HTTP and HTTPS ports as source ports. You can check for destination ports as well. Show Sample Output
2ss -o state established '( dport = :http or sport = :https )' -
1 = on ac, 0 = on bat
0cat /sys/class/power_supply/AC/online -
Just an alternative for `acpi -b` Show Sample Output
1eval "$(printf "echo %s \$((%i * 100 / %i))\n" $(cat $(find /sys -name energy_now 2>/dev/null | head -1 | xargs dirname)/{status,energy_{now,full}}))%" -
Bash's here string
4sudo -s <<< 'apt update -y && apt upgrade -y' -
Number of days back: change/append arbitrary amount of '\|'$[$(date +%Y%j)-x] expressions or specify any n-th day before today for a single day (you have to replace x with 3, 4, 5, whatever ... above I replaced it with 1 and 2 to get listing for yesterday and day before yesterday and 0 for today was not necessary, so left out). Q: How to narrow to *.pdf , *.png, *.jpg, *.txt, *.doc, *.sh or any type of files only? A: Pipe to grep at the end of command. Even shorter:
cd && day=3;for a in $(seq $day -1 0);do tree -aicfnF --timefmt %Y%j-%d-%b-%y|grep $[$(date +%Y%j)-$a];doneHere it's only needed to change amount of variable day to list period of days back - here is set to three days back (the seq command is adjusted for listing the oldest stuff first). Show Sample Output0cd && tree -aicfnF --timefmt %Y%j-%d-%b-%y|grep $(date +%Y%j)'\|'$[$(date +%Y%j)-1]'\|'$[$(date +%Y%j)-2] -
If you try to access cd - you go to the last folder you were in.
0cd -- - -
Remove lines from a bibtex file that have abstracts in them.
0sed '/^\s*abstract\s*=\s*{[^\n]*},$/ d' input.bib > output.bib -
This will also work with bash instead of sh shell sudo bash -c 'apt update -y && apt upgrade -y'
0sudo sh -c 'apt update -y && apt upgrade -y' -
"seq" has an additional parameter to use as INCREMENT. # seq FIRST INCREMENT LAST https://linux.die.net/man/1/seq Show Sample Output
1for i in $(seq 1 5) ; do echo $i ; done -
0seq 10 20
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Add this to a script and you can do ./scriptname site help or ./scriptname mput etc etc.
0all="$(echo -e $*|awk '{for(i=3;i<=NF;++i)print $i}'|xargs)"; lftp -e open <HOSTNAME> -p <PORT> -u <USER>:<PASSWORD> -e "$all;exit" -
Was to long with a loop, use a while loop for have it running 24/7
0inotifywait -r -q --format %w /var/log/auth.log|grep -i "Failed pass"|tail -n 1|grep -oE '\b([0-9]{1,3}\.){3}[0-9]{1,3}';iptables -I INPUT -i eth0 -s "$(cat /var/log/auth.log|grep "authentication failure; l"|awk -Frhost= '{print $2}'|tail -n 1)" -j DROP -
For ipv6 use: grep -oE "\b([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4}\b"
0for idiots in "$(cat /var/log/auth.log|grep invalid| grep -oE '\b([0-9]{1,3}\.){3}[0-9]{1,3}\b')"; do iptables -A INPUT -s "$idiots" -j DROP; done -
Bash's arithmetic evaluation.
1for((i=1;i<=10;i++)){ echo $i; } -
1for i in {1..10}; do echo $i; done
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0netstat -nap|grep 80|grep LISTEN
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0rangeBegin=10; rangeEnd=20; for ((numbers=rangeBegin; numbers<=rangeEnd; numbers++)); do echo $numbers; done
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iterating range of numer with for loop in shell or bash Show Sample Output
-1rangeBegin=10; rangeEnd=20; for numbers in $(eval echo "{$rangeBegin..$rangeEnd}"); do echo $numbers;done -
to test check if given variable is a digit / number Show Sample Output
1varNUM=12345; re='^[0-9]+$'; if ! [[ $varNUM =~ $re ]] ; then echo "error: Not a number"; fi -
Does the same but shows nicely progress in real time with correct Size in %. But also needs the packages sudo,dd,pv and dialog.
0image="file.iso";drive="/dev/null";sudo -- sh -c 'cat '"${image}"'|(pv -n -s $(stat --printf="%s" '"${image}"')|dd of='"${drive}"' obs=1M oflag=direct) 2>&1| dialog --gauge "Writing Image '"${image}"' to Drive '"${drive}"'" 10 70 7' - 1 2 3 > Last ›
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