PEXEC(1)

NAME

pexec - executing commands in parallel

SYNOPSIS

pexec [options] [-c|-m] [--] command [arguments] | 'compound command'

DESCRIPTION

Execute commands or shell scripts in parallel on a single host or on remote hosts using a remote shell.

OPTIONS

General options:: -h, --help
Gives general summary about the command line options.; --long-help
Gives a detailed list of command line options.; --version
Gives some version information about the program.; -s, --shell <shell>
Full path (e.g. /bin/sh) of the shell or interpreter to be used for script execution.; -c, --shell-command
Use the specified shell to interpret the command(s) instead of direct execution.; -m, --multiple-command
Allow multiple individual shell command scripts to be executed in parallel with the variation of the parameters.; -e, --environment <variable>
Name of an environmental variable which is set to the respective parameter before each execution.; -n, --number <number>
The maximal number of processes running simultaneously. The <number> itself can even be a complex specification of remote hosts (see documentation for more details).; -C, --control <port>
The control port of a hypervisor daemon (full path of a UNIX socket or an INET host specification).; -p, --list <list>
The single-argument form of main parameter list.; -r, --parameters <list>
The multiple-argument form of the main parameter list.; -f, --listfile <file>
The main parameter list file.; -w, --column <index>
The column index from where the parameters should be taken if they are read from a parameter file.; -t, --complete
Threat the whole line as a single parameter if the parameters are read from a file.; -z, --nice
Sets the scheduling priority of pexec and all children (executed processes) to the priority defined by this nice value.; -- A marker after which the command to execute begins.
Redirecting standard input, output and error:: -i, --input <input>
The (optionally formatted) name of the input file which is used for redirecting the standard input.; -o, --output <output>
The (optionally formatted) name of the output file which is used for redirecting the standard output.; -u, --error <output>
The (optionally formatted) name of the output error file, which is used for redirecting the standard error.; -R, --normal-redirection
Equivalent to specifying --output -, --error - and --input /dev/null.; -a, --output-format <format>
The format of the final standard output redirection if the output of all of the processes are gathered into the same file.; -b, --error-format <format>
The same final redirection format for the standard error.; -x, --omit-newlines
Disable automatic newlines after the output and error formats.
Execution using remote hosts:: -g, --remote-shell <remote_shell>
The name or full path of the remote shell to be used for building the tunnel between the local and the peer host(s). Default: ``/usr/bin/ssh''.; -P, --pexec <pexec>
The full path of the pexec program on the remote hosts. If this option is omitted, pexec tries to figure out from the invoking syntax and/or the current path.; -T, --tunnel
Internal use only (pexec will start in tunnel daemon mode).
Remote control, mutual exclusions and atomic command execution:: -y, --bind <port>
This option lets pexec to be remote controlled via INET or UNIX domain sockets.; -E, --pexec-connection-variable <env>
This option overrides the default environment name PEXEC_REMOTE_PORT to the specified value, which is used by the ``-p|--connect auto'' combination to determine the control socket with which the running pexec instance can be controlled.; -j, --remote
Used to remote control and/or poll the status of other running instances of pexec.; -p, --connect <port>
Remote control port to connect to.; -t, --status
Prints the actual status of the running jobs in a human-readable form.; -l, --lock <mutex>
Locks the specified mutex (if the mutex is not locked by someone else, otherwise it will block until the mutex is released).; -u, --unlock <mutex>
Unlocks the specified mutex.; -m, --mutex <mutex>
Name of the mutex.; -d, --dump <filename>
Dump the content of the given file to standard output, if ``-m|--mutex'' is given, this will be atomic.; -s, --save <filename>
Save the content of standard input to the given file, if ``-m|--mutex'' is given, this will be atomic.; -a, --atomic <command>
Execute the given command. If ``-m|--mutex'' is given, the exectution is going to be atomic with respect to that mutex.
Hypervisor mode:: -H, --hypervisor
Starts pexec in hypervisor mode.; -C, --control <port>
The control port used by the hypervisor.; -l, --load <window>
Use load also to limit the number of simultaneous processes with the specified load average interval (0, 1 or 2, or 1min, 5min or 15min, respectively).; -f, --fifo
First in first out queue processing.; -s, --lifo
Last in first out (stack) queue processing (default).
Logging:: -L, --log <file>
The name of the log file.; -W, --log-level <level>
The logging level.; -V, --verbose
Increase the log level by one.

REPORTING BUGS

Report bugs to <apal@szofi.elte.hu>

COPYRIGHT

This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.

This software was written by Andras Pal. The core part was written while working for the Hungarian-made Automated Telescope (HAT) project to make the data processing more easier and therefore find many-many extrasolar planets. See more information about this project: http://hatnet.hu. Another internal libraries (e.g. numhash.[ch]) were primarily written for other projects.

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