ps-reports process status

ps ” reports process status

ps [ acdefjl ] [ g grplist ] [ p proclist ]

   [ s sidlist ] [ t term ] [ u uidlist ]

ps prints information about active processes. Without options, ps prints information about processes associated with the controlling terminal. The output contains only the process ID, terminal identifier, cumulative execution time, and the command name . Otherwise, the information that is displayed is controlled by the options. The ps options are not the same for AT&T and Berkeley type versions of UNIX.

Example A.42.

1   ps -aux  grep '^linda'

#  ucb

2   ps -ef  grep '^ *linda'

# at&t

EXPLANATION

1. Prints all processes running and pipes the output to the grep program, and printing only those processes owned by user linda, where linda is at the beginning of each line. (UCB version)

2. Same as the first example, only the AT&T version.

pstree ”displays a tree of processes

pstree [-a] [-c] [-h] [-l] [-n] [-p] [-u] [-G-U][piduser]

pstree -V

pstree shows running processes as a tree. The tree is rooted at either pid or init if pid is omitted. If a username is specified, all process trees rooted at processes owned by that user are shown. pstree visually merges identical branches by putting them in square brackets and prefixing them with the repetition count, for example:

init-+-getty

    -getty

    -getty

    '-getty

becomes

init---4*[getty]