shell

Interesting that a lot of the (general, not specifically here) commentary is "don't use bash, use python" which I find quite clunky, noisy, and boilerplatey to do the same thing as a shell script. Kinda Master Foo and the Ten Thousand Lines†. Ruby's https://github.com/ruby/shell (which used to be bundled in Ruby itself) doesn't get much mention but is much more clear and useful to me. # system commands are not defined by default, only builtins, for safety Shell.def_system_command 'ls' Shell.def_system_command 'grep' Shell.def_system_command 'jq' Shell.new.transact do # simple redirs just work ls | grep('test') > 'some/file' ls | grep('other') | tee('foo') >> 'some/file' # pops at the end of the block cd 'some/dir' do # nested redir for demo (cat < 'foo.json') | jq '

> The Python and Ruby versions would be similar Not Ruby! sh = Shell.cd('/') sh.transact do system('tail -fq /var/log/nginx/access.log') | system("awk '{print $7}" | system("sort") | system("uniq -c") | system("sort -rn") end Pretty sure one could get without the system method with Shell having def method_missing(meth, * args) to call system([meth.to_s, * args]) or something, turning it into: sh.transact do tail '-fq' '/var/log/nginx/access.log' | awk '{print $7}' | sort | uniq '-c' | sort '-rn' end https://github.com/ruby/shell#pipe-etcprintcap-into-a-file

ruby in some cases feel just like shell scripting, even more than perl.. you can even do piping to chain two commands together https://stackoverflow.com/questions/4234119/ruby-pipes-how-d... (edit: using the shell library https://github.com/ruby/shell so, not out of box in ruby, unfortunately, which is a mortal sin for replacing bash in scripts =/) Here are the ways to run a program in ruby https://stackoverflow.com/questions/7212573/when-to-use-each...