CLIs of the day

cut

Demo file demo.txt:

here,are,some
comma,separated,values
de mo,file,t x t

# Get the N-th column by using SEP as separator
cut -d SEP -f N FILE

Example:

$ cut -d "," -f 1 demo.txt
here
comma
de mo

You can also pipe into cut instead of specifying FILE.

sed

# Substitute
sed 's/OLD/NEW/g' FILE

# Delete line that contains PATTERN
sed '/PATTERN/d' FILE

Example:

$ sed 's/values/strings/g' demo.txt
here,are,some
comma,separated,strings
de mo,file,t x t

$ sed '/separated/d' demo.txt
here,are,some
de mo,file,t x t

You can also pipe into sed instead of specifying FILE.

When you specify FILE, you can use the option -i to operate inplace. This means that the file is modified directly.

find

Find everything ending with .sh of type file (f) using globbing:

find . -type f -name '*.sh'

Using regex:

find . -type f -regex '.+\.sh'