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这个很少用啊： $! holds the PID of the last command that was executed in the background.

647i(though)

jin@tt:/tmp/BOINC> ls &
[1] 28607
account_lhcathome.cern.ch_lhcathome.xml  get_current_version.xml                 run_client
account_qah.uni-muenster.de.xml          get_project_config.xml                  run_manager
all_projects_list.xml                    global_prefs_override.xml               sched_reply_lhcathome.cern.ch_lhcathome.xml
binstall.sh                              global_prefs.xml                        sched_reply_qah.uni-muenster.de.xml
boinc                                    gui_rpc_auth.cfg                        sched_request_lhcathome.cern.ch_lhcathome.xml
boinc_cmd                                job_log_qah.uni-muenster.de.txt         sched_request_qah.uni-muenster.de.xml
boincmgr                                 locale                                  slots
boincmgr.16x16.png                       lockfile                                statistics_lhcathome.cern.ch_lhcathome.xml
boincmgr.32x32.png                       lookup_account.xml                      statistics_qah.uni-muenster.de.xml
boincmgr.48x48.png                       lookup_website.html                     stderrdae.txt
ca-bundle.crt                            master_lhcathome.cern.ch_lhcathome.xml  stdoutdae.txt
client_state_prev.xml                    master_qah.uni-muenster.de.xml          time_stats_log
client_state.xml                         nohup.out
create_account.xml                       projects
jin@tt:/tmp/BOINC> echo $!
28607
[1]+  Done                    ls $LS_OPTIONS
jin@tt:/tmp/BOINC>

(#4788090@0)
Last Updated: 2008-10-23
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工作学习 / 学科技术讨论 / Can someone explained a little bit more about "echo $!"? google doesn't return much I guess becoz the special character. THX a lot -bentley(小兔); 2008-10-23 (#4788088@0)

这个很少用啊： $! holds the PID of the last command that was executed in the background. -647i(though); 2008-10-23 {1549} (#4788090@0)

jin@tt:/tmp/BOINC> ls &
[1] 28607
account_lhcathome.cern.ch_lhcathome.xml  get_current_version.xml                 run_client
account_qah.uni-muenster.de.xml          get_project_config.xml                  run_manager
all_projects_list.xml                    global_prefs_override.xml               sched_reply_lhcathome.cern.ch_lhcathome.xml
binstall.sh                              global_prefs.xml                        sched_reply_qah.uni-muenster.de.xml
boinc                                    gui_rpc_auth.cfg                        sched_request_lhcathome.cern.ch_lhcathome.xml
boinc_cmd                                job_log_qah.uni-muenster.de.txt         sched_request_qah.uni-muenster.de.xml
boincmgr                                 locale                                  slots
boincmgr.16x16.png                       lockfile                                statistics_lhcathome.cern.ch_lhcathome.xml
boincmgr.32x32.png                       lookup_account.xml                      statistics_qah.uni-muenster.de.xml
boincmgr.48x48.png                       lookup_website.html                     stderrdae.txt
ca-bundle.crt                            master_lhcathome.cern.ch_lhcathome.xml  stdoutdae.txt
client_state_prev.xml                    master_qah.uni-muenster.de.xml          time_stats_log
client_state.xml                         nohup.out
create_account.xml                       projects
jin@tt:/tmp/BOINC> echo $!
28607
[1]+  Done                    ls $LS_OPTIONS
jin@tt:/tmp/BOINC>

THX. I saw this used in a script to keep some PID run as &. I won't use the script but it's nice to know this :-) -bentley(小兔); 2008-10-23 (#4789064@0)

@Calgary

这个很少用啊： $! holds the PID of the last command that was executed in the background.

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