diff options
Diffstat (limited to 'man')
| -rw-r--r-- | man/man1/chn.1df | 47 | ||||
| -rw-r--r-- | man/man1/maybe.1df | 2 | ||||
| -rw-r--r-- | man/man1/try.1df | 2 |
3 files changed, 49 insertions, 2 deletions
diff --git a/man/man1/chn.1df b/man/man1/chn.1df new file mode 100644 index 00000000..576e5425 --- /dev/null +++ b/man/man1/chn.1df @@ -0,0 +1,47 @@ +.TH CHN 1df "January 2017" "Manual page for chn" +.SH NAME +.B chn +\- filter standard input through multiple runs of a command +.SH USAGE +.B chn +COUNT +COMMAND [ARG1...] +.SH DESCRIPTION +Run the given command the specified number of times, passing the standard +output of each run into the standard input of the next. +.P +As an example, to quote some text with quo(1df) repeatedly: +.P + $ cat msg + Hello! + $ chn 2 quo < msg + >> Hello! + $ chn 5 quo < msg + >>>> Hello! +.P +Zero is a valid count; in this case the input is passed untouched to output: +.P + $ chn 0 quo < msg + Hello! +.P +Don't confuse this with simply repeating a command. This happens to work: +.P + $ chn 5 sync +.P +But this will not do what you expect: +.P + $ chn 5 echo foo +.SH CAVEATS +It's slow. +.P +It's not a real pipe. The commands are run successively, not in parallel. That +means you can't pass one line to it and have it return another line before +sending EOF, for unbuffered (e.g. linewise) tools. +.P +There's almost certainly a better way to do this, fixing one or both of the +above issues, and possibly even in shell; maybe with curlier file descriptor +logic to save unneeded open(2) syscalls. I smell `eval` usage on the horizon. +.SH SEE ALSO +maybe(1df), try(1df) +.SH AUTHOR +Tom Ryder <tom@sanctum.geek.nz> diff --git a/man/man1/maybe.1df b/man/man1/maybe.1df index e313eb17..3b89b09d 100644 --- a/man/man1/maybe.1df +++ b/man/man1/maybe.1df @@ -22,6 +22,6 @@ of success or failure. rndi(1df) is used for the randomness. $ maybe 3 $ maybe 2 5 .SH SEE ALSO -true(1), false(1), try(1df), rndi(1df) +true(1), false(1), chn(1df), try(1df), rndi(1df) .SH AUTHOR Tom Ryder <tom@sanctum.geek.nz> diff --git a/man/man1/try.1df b/man/man1/try.1df index d982c1d3..63db5209 100644 --- a/man/man1/try.1df +++ b/man/man1/try.1df @@ -17,6 +17,6 @@ run. $ try maybe $ try -n5 -s10 gms .SH SEE ALSO -maybe(1df) +maybe(1df), chn(1df) .SH AUTHOR Tom Ryder <tom@sanctum.geek.nz> |