Command Execution
The primary prompt (PS1 - default $ or # for super-users) is displayed whenever the Korn shell is ready to read a command. The secondary prompt (PS2 - default >) is displayed when the Korn shell needs more input.
Command Execution Format
| command1 ; command2 | execute command1 followed by command2 |
| command & | execute command asynchronously in the background; do not wait for completion |
| command1 | command2 | pass the standard output of command1 to standard input of command2 |
| command1 && command2 | execute command2 if command1 returns zero (successful) exit status |
| command1 || command2 | execute command2 if command1 returns non-zero (unsuccessful) exit status |
| command | & | execute command asynchronously with its standard input and output attached to the ... |
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