xargs

xargs - build and execute command lines from standard input

SYNOPSIS
xargs  [-0prtx]  [-E eof-str] [-e[eof-str]] [--eof[=eof-str]] [--null] [-d delimiter] [--delimiter delim-
iter]  [-I  replace-str]  [-i[replace-str]]  [--replace[=replace-str]]  [-l[max-lines]]  [-L   max-lines]
[--max-lines[=max-lines]]  [-n max-args] [--max-args=max-args] [-s max-chars] [--max-chars=max-chars] [-P
max-procs]   [--max-procs=max-procs]    [--interactive]    [--verbose]    [--exit]    [--no-run-if-empty]
[--arg-file=file] [--version] [--help] [command [initial-arguments]]


--max-args=max-args, -n max-args
Use at most max-args arguments per command line.  Fewer than max-args arguments will  be  used  if
the  size (see the -s option) is exceeded, unless the -x option is given, in which case xargs will
exit.

如何将两行合并成一行
cat first.log |xargs -n5