Difference between revisions of "Object3D"

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(linux tips)
(linux tips)
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umask u=rwx,g=rwx,o=
 
umask u=rwx,g=rwx,o=
  
* set default group
+
* Set default group
 
newgrp groupname
 
newgrp groupname
 
   Remark: this command will start a nested shell. If you want to use the command in a startup script like in .bashrc, to avoid infinite loop, you should put it in an "if" expression like this:  
 
   Remark: this command will start a nested shell. If you want to use the command in a startup script like in .bashrc, to avoid infinite loop, you should put it in an "if" expression like this:  
Line 13: Line 13:
  
  
* Change default shell:
+
* Change default shell
 
chsh -s /bin/bash haosu
 
chsh -s /bin/bash haosu
  
 
+
* I/O Redirection
 
+
if you want to redirect both standard out and standard error, you can use: 1>out 2>&1, where out is a filename, 1 stands for STDOUT, and 2 for STDERR
I/O Redirection: if you want to redirect both standard out and standard error, you can use: 1>out 2>&1
 
  
 
=== python tips ===
 
=== python tips ===

Revision as of 21:34, 31 December 2008

linux tips

  • Changing Default permissions when creating a new directory

umask u=rwx,g=rwx,o=

  • Set default group

newgrp groupname

 Remark: this command will start a nested shell. If you want to use the command in a startup script like in .bashrc, to avoid infinite loop, you should put it in an "if" expression like this: 
 if [ `id -gn` != "object3d" ] 
 then
   newgrp object3d
   exit
 fi


  • Change default shell

chsh -s /bin/bash haosu

  • I/O Redirection

if you want to redirect both standard out and standard error, you can use: 1>out 2>&1, where out is a filename, 1 stands for STDOUT, and 2 for STDERR

python tips

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