oneliners-bash

oneliners-bash.sh

# split a file (sp500.csv) with 101 lines each with numeric suffixes and additional extension suffixes
split --numeric-suffixes=1 -l 101 sp500.csv stock --additional-suffix=".csv"; ls stock*.csv

# the output is as below
stock01.csv  stock02.csv  stock03.csv  stock04.csv  stock05.csv

# gnome graphical font size
#   fontsize 1.5 <-- to make it bigger
#   fontsize     <-- to reset to normal
#   fontsize 0.7 <-- to make it smaller
fontsize ()
{
    [[ -n ${1} ]] && echo "setting" && gsettings set org.gnome.desktop.interface text-scaling-factor ${1};
    [[ -z ${1} ]] && echo "reset" && gsettings reset org.gnome.desktop.interface text-scaling-factor
}

# lorem-epsum generate 40 lines of text
# curl generates 40 lines in a single paragraph, use awk to split each line at period and print with the record number
curl -sk http://metaphorpsum.com/sentences/40 | gawk 'BEGIN {RS="."} { gsub(/^ /,"", $0); printf "%2d %s\n", NR, $0}'

# using random generator from bash, 20 lines control with head
tr -dc a-z1-4 </dev/urandom | tr 1-2 ' \n' | awk 'length==0 || length>50' | tr 3-4 ' ' | sed 's/^ *//' | cat -s | sed 's/ / /g' | head | fmt
base64 /dev/urandom | awk '{print(0==NR%10)?"":$1}' | sed 's/[^[:alpha:]]/ /g' | head -50

# more of it here ---> https://unix.stackexchange.com/questions/97160/is-there-something-like-a-lorem-ipsum-generator

# sending api key/secrets using text message
# echo the secret string, using open ssl to encrypt it and then convert to hex string so it is easy to transfer
echo "myapikey" | openssl aes-256-ecb -a -pass "pass:<pass>" -e 2>/dev/null | xxd -u | cut -c1-50

# reverse operation; assuming you have the output of the above command in a text file out.txt
cat out.txt | xxd -r | openssl aes-256-ecb -a -pass "pass:<pass>" -d

# oneliner shell script + jq see filterjson.py for more explanation
while IFS= read -r line; do jq -r --arg id "$line" 'to_entries | .[] | select(.key == $id)' contents.json; done < keyfilter.txt | jq -s '.|from_entries'