unix - Bad use of parentheses -


i've been stuck on hours:

cd /dir1 (cd $home); pwd;

why pwd still /dir1 , didn't go home directory?

parentheses start subshell: shell calls fork, , commands inside parentheses executed in subprocess. parent process waits subprocess exit resumes execution. what's happening is:

  • execution of cd /dir1: shell performs chdir("/dir1").
  • execution of parentheses: shell calls fork, parent process waits child exit.
  • execution of cd $home: subshell performs chdir("/home/jurgen").
  • the subshell has run out of commands, exits.
  • the subshell has exited, wait call in parent returns.
  • execution of pwd: shell prints current directory, /dir1.

Comments

Post a Comment

Popular posts from this blog

php - Wordpress website dashboard page or post editor content is not showing but front end data is showing properly -

Image
recently have uploaded wordpress site onto server. have uploaded wordpress site in sub-folder under root folder ../root(domain root folder)/wordpress (where host wordpress folder). now problem content data in page or post in dashboard of wordpress admin panel not showing - see image. but data showing in front view - see image. if not browser cache issue , not issue happened tinymce editor during upgrade; try add config file: define('concatenate_scripts', false);
Read more

javascript - Get parameter of GET request -

i make request: createxhrrequest( "get", fileurl, function( err, response ) { if( err ) { alert( "error get!" ); } alert(response); }); and full response: { "status" : "ok", "message" : "jvberi0xljqkjdduxdgkmy how can jvberi0xlj ? i try response.message , response["message"]. nothing works. just simple access this: var json = json.parse(response); json.message
Read more

javascript - Twitter Bootstrap - how to add some more margin between tooltip popup and element -

Image
i have not tryed since can't understand space between tooltip , element made/added bootstrap, tooltip near element triggers tooltip event. i make tooltip opening little bit away element, add more margin tooltip , eleemnt mean. i understand how in css if possible , if possible make both right,left,top,bottom tooltips hope question clear. this how tooltips looks on app: and , how should looks after this default css tooltip on top : .tooltip.top { padding: 5px 0; margin-top: -3px; } you can override in own css : .tooltip.top { margin-top: -10px; } note code work work tooltip on top, you'll nedd adapt css 3 other orientations : .tooltip.top { margin-top: -10px; } .tooltip.right { margin-left: 10px; } .tooltip.bottom { margin-top: 10px; } .tooltip.left { margin-left: -10px; }
Read more