-tTurns on the timing option. The amount of time each subsequent command takes to execute is displayed.

host_name Executes subsequent commands on the specified host. -hPrints command usage to stderr and exits.

-VPrints LSF release version to stderr and exits.

Usage

The ch command interprets the following built-in commands:

cd [directory_name] Changes the current working directory to the specified directory. If a directory is not specified, changes to the user’s home directory by default.

ch [host_name] Changes the current working host to the specified host. If a host is not specified, changes to the home host by default.

post [command [argument ...]]

Posts the specified command for execution in the background on the current working host. ch assigns a unique task ID to this command and displays this ID, then continues to interact with the user. However, the output of background jobs may disturb the screen. You can post multiple commands on one host or on different hosts. When a previously posted command is completed, ch reports its status to the standard error. If a command is not specified, ch displays all currently running background commands.

contact task_ID Brings a previously posted background command into the foreground. task_ID is the ID returned by the post command. Standard input is now passed to this foreground command. You cannot put an active foreground job into the background. A command that has been brought into the foreground with the contact command cannot be put back into the background.

exit Exits ch if there are no posted commands running. Typing an EOF character (usually CTRL-Dbut may be set otherwise, see stty(1)) forces ch to exit; uncompleted posted commands are killed.

Limitations

Currently, the ch command does not support script, history, nor alias.

The ch prompt is always the current working host:current working directory followed by a > (right angle bracket) character. If the ch session is invoked by a shell that supports job control (such as tcsh or ksh), CTRL-Zsuspends the whole ch session. The exit status of a command line is printed to stderr if the status is non-zero.

See also

lsrun(1), rsh(1), stty(1)

Platform LSF Command Reference 217