uniq: missing support for deprecated -f syntax

[jfinkels]

Similar to #2507. The -f <num> option to uniq has a deprecated syntax, -<num>. See https://www.gnu.org/software/coreutils/manual/html_node/uniq-invocation.html For example,

$ printf "a a\nb a\n" | uniq -1
a a

[angus-lherrou]

I don't know if this is possible to specify with clap.

[angus-lherrou]

Actually, it should be possible with a multiple flag for each digit, which is the way GNU uniq does it. I'll try my hand at this.

[Leviticoh]

how did it go? i'd like to try if no one is working on it

[sylvestre]

sure, please do :)

[angus-lherrou]

how did it go? i'd like to try if no one is working on it

yes, go for it—I fully do not remember what I ended up doing haha

[sylvestre]

it works now :)