open vim
vim [file name]
insert mode on vim
i
write and quit on vim
:wq
quit without save on vim
"q!
run bash script with bash interpreter
bash [script name]
print work directory
pwd
code to give intrepreter on bash file (sh)
#!/bin/bash
run bash script with intrepreter on it
./[script name.sh]
if permission denied, give it permission
chmod u+x [script name.sh]
overwrite to file
echo [text] > [file name.txt]
append to file
echo [text] >> [file name.txt]
word count
wc -w [file name.txt]
word count redirect input
wc -w < [file name.txt]
EOF
cat << EOF
then close with
EOF
input redirect triple less
wc -w <<< ["any string"]
code equal
[ [a] = [b] ] or [ [a] -eq [b] ]
create array
VARIABLE = (one two three four five)
print all data on array
echo ${VARIABLE[@]}
print index data
echo ${VARIABLE[0]}
for loop
for item in ${VARIABLE[@]}; do echo -n $item | wc -c; done
awk print positional file
awk '{print $1}' [file name.txt]
awk print csv file
awk -F, '{print $1} [csv file name.csv]'
sed to replace text
sed 's/[file to replace]/[replace to]/g' [file name.txt]
create backup file with sed
sed -i.ORIGINAL 's/[file to replace]/[replace to]/g' [file name.txt]