Convert a script to one-liner

(sed 's/#.*//g'|sed '/^ *$/d'|tr '\n' ';'|xargs echo) <
Opposite: Convert an one-liner to script: foo() { <one-liner> ; } ... typeset -f foo ... unset -f foo

By: knoppix5
2013-10-26 23:23:51

What Others Think

What a fascinating idea :-) Unfortunately, it's easily confused. Many compound statements get unnecessary semi-colons: if [ "$x" = 1 ]; then; echo one; fi Also, one of my favourite shell variables gets chewed up: $# (the number of parameters).
flatcap · 458 weeks and 6 days ago
slightly improoved, yet far from perfect: (sed '/if *$\|then *$\|else *$/!s/$/;/g'|sed 's/^#.*;\| #.*;//g'|xargs echo) <
knoppix5 · 458 weeks and 6 days ago
I ended up with: (sed -e 's/^\s*\(.*\)\s*/\1/' -e 's/\([^$]\|^\)#.*//' -e '/^$/d' | paste -s -d\; | sed -e 's/\<\(then\|do\)\>;/\1 /g') < sed part 1: trim leading/trailing whitespace sed part 2: # at the beginning of a line, or # (but not preceded by $) sed part 3: delete empty lines paste: join lines with a ; sed part 4: replace 'then;' or 'do;' with 'then' or 'do' However, your 'xargs echo' is much nicer. (sed -e 's/\([^$]\|^\)#.*//' -e '/^$/d' | tr '\n' ';' | xargs echo | sed -e 's/\<\(then\|do\)\>;/\1/g') <
flatcap · 458 weeks and 6 days ago ??? ? ????? ????
seofox · 27 weeks and 3 days ago
seofox · 26 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: