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.
|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 ...|