RHCSA RHEL 8 - Use grep and regular expressions to analyse text скачать в хорошем качестве

RHCSA RHEL 8 - Use grep and regular expressions to analyse text

Buy CSG Merchandise: http://tee.pub/lic/csg Patreon page:   / computers_servers   This video is based on RHEL 8. Video to cover the section 'Use grep and regular expressions to analyse text' for the RHCSA (Red Hat Certified System Administrator). More information on the required learning: https://www.redhat.com/en/services/tr... Summary of the common regular expressions: [ ]: Matches any one of a set characters [ ] with hyphen: Matches any one of a range characters ^: The pattern following it must occur at the beginning of each line ^ with [ ] : The pattern must not contain any character in the set specified $: The pattern preceding it must occur at the end of each line . (dot): Matches any one character \ (backslash): Ignores the special meaning of the character following it *: Zero or more occurrences of the previous character (dot).*: Nothing or any numbers of characters. Commands used in this video: [ ] : Matches any one of a set characters: $grep "[CcFf]a[RrTt]" kafka.txt Use [ ] with hyphen: Matches any one of a range characters: $grep "da[a-z]" kafka.txt $grep "da[a-i][a-z]" kafka.txt Use ^: The pattern following it must occur at the beginning of each line: $grep "^He" kafka.txt Display list of directories only: $ls –l |grep "^d" Display list of regular files only: $ls –l |grep "^-" Use ^ with [ ]: The pattern must not contain any character in the set specified: $grep "d[^a-i]e" kafka.txt Use $: The pattern preceding it must occur at the end of each line: $ grep "got$" kafka.txt Use . (dot): Matches any one character: $ grep "st..id" kafka.txt Use \ (backslash): Ignores the special meaning of the character following it: $ grep "out\.$" kafka.txt $ grep "Hell\!" kafka.txt Use *: zero or more occurrences of the previous character: $ grep "hap*[e-z]n[a-i]d" kafka.txt Use (dot).*: Nothing or any numbers of characters: $ grep "hap.*ed" kafka.txt