par

NAME
SYNOPSIS
DESCRIPTION
FILES
HISTORY

NAME

par − parallel command processing

SYNOPSIS

par [−defiqx] [−c  command] [−l  logfile] [−n #] [−p #] [file [file...]]

DESCRIPTION

par takes a list of files to run a command on. The first line of each file begins with a colon (:) or a pound-sign (#). If a colon, the remainder of the line is a command to run for each of the subsequent lines. If a pound-sign, then each subsequent line is a (self-contained) command, unless the −c option was specified, in which case it operates as if the argument to −c had followed a colon on the first line.

In each of the cases where the lines of the file following the first are not commands (ie: colon or -c), instances of open-close braces ({}) in the command will be replaced by these values.

For example, an inputfile whose contents is:

: echo {}

a

b

c

run with par like so:

%par -q inputfile

will produce the following output (order will vary):

b

a

c

The command-line options are as follows:

−c

Command to be run on each of the arguments following the command-line options, where the first line of the input file(s) begins with a pound-sign (#).

−d

Print debugging information on standard error (stderr). Repeat the option up to three times for more verbosity.

−e

Split args by spaces, rather than using sh -c. Note: −e is incompatible with the −i option.

−f

No input file or STDIN, just run a quantity of the command specified with -c.

−i

Run commands interactively through (multiple) xterm(1) processes.

−l

Prefix of logfile name, as in prefix.N where N is the par process number ([0..]).

Default: par.log.<time>.[0..]

−n

Number of simultaneous processes.

Default: 3

−p N

Pause N seconds between running commands.

−q

Quiet mode. Omit the typical processing logs and do not create the log files from -l, instead the children inherit stdout and stderr from par. −q is mutually exclusive with the −x and −l options and the option appearing last will take precedence.

−x

View par logs in real-time via an xterm(1).

FILES

par.log.T.N Log file; where T is the current time in seconds since the
epoch and N is the par process number ([0..]).

HISTORY

par was ported from the perl version.