| Rev | Author | # | Line |
|---|---|---|---|
| 1 | perry | 1 | !!NAME |
| 4 | CraigBox | 2 | xargs - build and execute command lines from standard input |
| 1 | perry | 3 | |
| 4 | !!SYNOPSIS | ||
| 5 | |||
| 3 | PerryLorier | 6 | __xargs__ [[-0prtx] [[-e[[eof-str]] [[-i[[replace-str]] [[-l[[max-lines]] [[-n max-args] [[-s max-chars] [[-P max-procs] [[--null] [[--eof[[=eof-str]] [[--replace[[=replace-str]] [[--max-lines[[=max-lines]] [[--interactive] [[--max-chars=max-chars] [[--verbose] [[--exit] [[--max-procs=max-procs] [[--max-args=max-args] |
| 7 | [[--no-run-if-empty] [[--version] [[--help] [[command [[initial-arguments]] | ||
| 8 | |||
| 1 | perry | 9 | !!DESCRIPTION |
| 3 | PerryLorier | 10 | This manual page documents the GNU version of __xargs__. __xargs__ reads arguments from the standard input, delimited by blanks (which can be protected with double or |
| 11 | single quotes or a backslash) or newlines, and executes the ''command'' (default is /bin/echo) one or more times with any ''initial-arguments'' followed by arguments read from standard input. Blank lines on the standard input are ignored. | ||
| 1 | perry | 12 | |
| 13 | __xargs__ exits with the following status: | ||
| 3 | PerryLorier | 14 | |0| if it succeeds |
| 15 | |123| if any invocation of the command exited with status 1-125 | ||
| 16 | |124| if the command exited with status 255 | ||
| 17 | |125| if the command is killed by a signal | ||
| 18 | |126| if the command cannot be run | ||
| 19 | |127| if the command is not found | ||
| 20 | |1| if some other error occurred. | ||
| 1 | perry | 21 | |
| 3 | PerryLorier | 22 | !!OPTIONS |
| 1 | perry | 23 | |
| 3 | PerryLorier | 24 | ;''--null, -0'': Input filenames are terminated by a null character instead of by whitespace, and the quotes and backslash are not special (every character is taken literally). Disables the end of file string, which is treated like any other argument. Useful when arguments might contain white space, quote marks, or backslashes. The GNU find -print0 option produces input suitable for this mode. |
| 1 | perry | 25 | |
| 3 | PerryLorier | 26 | ;''--eof[[=eof-str], -e[[eof-str]'': Set the end of file string to ''eof-str''. If the end of file string occurs as a line of input, the rest of the input is ignored. If ''eof-str'' is omitted, there is no end of file string. If this option is not given, the end of file string defaults to '' |
| 1 | perry | 27 | |
| 3 | PerryLorier | 28 | ;''--help'': Print a summary of the options to __xargs__ and exit. |
| 1 | perry | 29 | |
| 5 | DanielLawson | 30 | ;''--replace[[=replace-str], -i[[replace-str]'': Replace occurences of ''replace-str'' in the initial arguments with names read from standard input. Also, unquoted blanks do not terminate arguments. If ''replace-str'' is omitted, it defaults to ''{}'', like ''find -exec''. Implies ''-x'' and ''-l 1''. |
| 1 | perry | 31 | |
| 3 | PerryLorier | 32 | ;''--max-lines[[=max-lines], -l[[max-lines]'': Use at most ''max-lines'' nonblank input lines per command line; ''max-lines'' defaults to 1 if omitted. Trailing blanks cause an input line to be logically continued on the next input line. Implies ''-x''. |
| 1 | perry | 33 | |
| 3 | PerryLorier | 34 | ;''--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. |
| 1 | perry | 35 | |
| 3 | PerryLorier | 36 | ;''--interactive, -p'': Prompt the user about whether to run each command line and read a line from the terminal. Only run the command line if the response starts with `y' or `Y'. Implies ''-t''. |
| 1 | perry | 37 | |
| 3 | PerryLorier | 38 | ;''--no-run-if-empty, -r'': If the standard input does not contain any nonblanks, do not run the command. Normally, the command is run once even if there is no input. |
| 1 | perry | 39 | |
| 40 | |||
| 3 | PerryLorier | 41 | ;''--max-chars=max-chars, -s max-chars'': Use at most ''max-chars'' characters per command line, including the command and initial arguments and the terminating nulls at the ends of the argument strings. The default is as large as possible, up to 20k characters. |
| 1 | perry | 42 | |
| 3 | PerryLorier | 43 | ;''--verbose, -t'': Print the command line on the standard error output before executing it. |
| 1 | perry | 44 | |
| 45 | |||
| 3 | PerryLorier | 46 | ;''--version'': Print the version number of __xargs__ and exit. |
| 1 | perry | 47 | |
| 3 | PerryLorier | 48 | ;''--exit, -x'': Exit if the size (see the ''-s'' option) is exceeded. |
| 1 | perry | 49 | |
| 3 | PerryLorier | 50 | ;''--max-procs=max-procs, -P max-procs'': Run up to ''max-procs'' processes at a time; the default is 1. If ''max-procs'' is 0, __xargs__ will run as many processes as possible at a time. Use the ''-n'' option with ''-P''; otherwise chances are that only one exec will be done. |
| 1 | perry | 51 | |
| 52 | !!EXAMPLE | ||
| 2 | StuartYeates | 53 | |
| 54 | If you're using the command: | ||
| 55 | |||
| 4 | CraigBox | 56 | ''grep 7d archive/*'' |
| 2 | StuartYeates | 57 | |
| 3 | PerryLorier | 58 | and the ''archive'' directory has grown too large and is now giving the error ''Argument list too long'' you can use: |
| 2 | StuartYeates | 59 | |
| 60 | ''find archive -type f | xargs grep '7d''' | ||
| 61 | |||
| 3 | PerryLorier | 62 | This could also be done using the -exec option to find, but this approach causing a process creation for each file. |
| 2 | StuartYeates | 63 | |
| 1 | perry | 64 | !!SEE ALSO |
| 3 | PerryLorier | 65 | find(1), locate(1), locatedb(5), updatedb(1) __Finding Files__ (on-line in Info, or printed) |
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