[SOLVED] awk to print selective lines matching regex in single expression

Issue

Team, I have specific lines to be printed.

output is below.

what i want is:

1 - whenever there is Rx where x=any number and R is alphabet R exists in first column of below output it should print me the $3 that is 3rd column.

2 - whenever there is no Rx in first column but M it should print column 2. so expected output is below

Command> git diff HEAD~1 --name-status

R063    src/services/jamoperator/events/BUILD.bazel    src/common/jam/operator/events/BUILD.bazel
R060    src/services/jamoperator/events/events.go      src/common/jam/operator/events/events.go
R100    src/services/jamoperator/events/events_test.go src/common/jam/operator/events/events_test.go
M       src/services/jamoperator/operator_test.go
R100    src/services/secrets/keys/keys.go       src/services/secrets/keys/keys.go1
M       src/services/secrets/main.go

expected output.

src/common/jam/operator/events/BUILD.bazel
src/common/jam/operator/events/events.go
src/common/jam/operator/events/events_test.go
src/services/jamoperator/operator_test.go
src/services/secrets/keys/keys.go1
src/services/secrets/main.go

i tried and got 1st part but want to assure is this the right way? git diff HEAD~1 --name-status | awk '$1 ~ /R./ { print $3}'

also the second part like this git diff HEAD~1 --name-status | awk '$1 ~ /M/ { print $2}'

so are both my approaches correct? is there a way I can build single expression?

Solution

Combining your two awk all in one:

git diff HEAD~1 --name-status | awk '$1 ~ /^R[0-9]/{print $3} $1 ~ /^M/{print $2}'

Decomposed:

git diff HEAD~1 --name-status |
    awk '
        $1 ~ /^R[0-9]/ {print $3}
        $1 ~ /^M/      {print $2}
    '

Output

src/common/jam/operator/events/BUILD.bazel
src/common/jam/operator/events/events.go
src/common/jam/operator/events/events_test.go
src/services/jamoperator/operator_test.go
src/services/secrets/keys/keys.go1
src/services/secrets/main.go

Answered By - Gilles Quénot

Answer Checked By - Robin (WPSolving Admin)