Tools for the Posix and Nushell Command Line

Tools in the posix and nushell command line

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grep find one of two patterns

grep -e pattern1 -e pattern2

split and reunite large files

#split in 3GiB sized files and then reunite
split -b 3G file_to_split.iso file_to_split.iso
cat file_to_split.iso* > file_to_split.iso

python compute days

>>> from datetime import date
>>> a=date(2021,8,26)
>>> b=date(2021,9,15)
>>> c=date(2021,11,15)
>>> d=date(2022,3,3)
>>> (a-b).days
-20
>>> (b-a).days
20
>>> (d-c).days
108
>>> 20+108
128
>>> #compute final date that is 119 days later
>>> from datetime import date, timedelta
>>> end_date=date.today()+timedelta(days=119)

nushell compute days

("28-sep-2024" | into daytime) + (119day)
(date now) + (2day)

beep timer in nushell and posix command line

(
    date now | print;
    printf "TIMER_MESSAGE\n";
    (date now) + (30min) | print;
    sleep 30min;
    printf "BEEPING\n";
    for $it in 0..999999 {
        sleep 1sec; printf "\a"
    }
)
printf "\a"
#if the command 'printf "\a"' above does not generate a sound
#'gnome-terminal --sh -c 'printf "\a"''
#above sidesteps that buggy situation

grep recursive full text search

grep -rnw folder -e 'PATTERN'

list files by size recursively

du -ah . | grep -v "/$" | sort -rh | less

sed replace text in file

sed -i -- 's/foo/bar/g' file_path

grep find files with extension sh

find * | grep -i '\.sh$'

sed comment lines in shell script

sed -i '2,4 s/^/#/' file_path

apt exact search

apt search ^golang$

invert grep search

ls -alh | grep -v regex_to_exclude

Open websites with xargs and xdg-open

printf "https://www.web1.com\nhttps://www.web2.com\n" \
    | xargs -I website xdg-open website

git good looking log command options

git log -2 --oneline --decorate --graph --all

git wipe latest commit

#!!! - WARNING - VERY DANGEROUS COMMAND
#!!! - BY RUNNING IT YOU MAY LOOSE IMPORTANT DATA
#!!! - KNOW WHAT YOU ARE DOING BEFORE RUNNING THIS COMMAND
git reset --hard HEAD~1