| grep --line-regexp ' | : http://bash.open-code.club/Linux驛｢・ｧ繝ｻ・ｳ驛｢%9D隶抵ｽｭ・趣ｽｦ驛｢%9D%89/E/egrep.html | |
| grep --line-regexp --quiet bravo | bash - --line-regexp option with null data - Stack Overflow : http://stackoverflow.com/questions/31467045/line-regexp-option-with-null-data | |
| grep --line-regexp PATTERN | grep command examples ~ Linux IQ : http://linuxadministrative.blogspot.com/2014/06/grep-command-examples.html |