record filtering in Guile try: relpipe-in-fstab | relpipe-tr-guile 'fstab' '(= pass 2)' | relpipe-out-tabular relpipe-in-fstab | relpipe-tr-guile 'fstab' '(equal? mount_point "/")' | relpipe-out-tabular

link to the Guile library and add some Guile demo code – evaluate code from CLI argument try: relpipe-in-fstab | relpipe-tr-guile 'fstab' '(or (= a b) (= a a) )' | relpipe-out-tabular relpipe-in-fstab | relpipe-tr-guile 'fstab' '(or (= a b) (= a 9) )' | relpipe-out-tabular

project skeleton