hey this is the first file and yes i am exciterd[ashok@new-host-4 ~]$ cd aaa
[ashok@new-host-4 aaa]$ ls -l
total 0
drwxrwxr-x. 3 ashok ashok 16 Dec 28 23:20 bbb
[ashok@new-host-4 aaa]$ ls -a
. .. bbb
[ashok@new-host-4 aaa]$ touch ashok
[ashok@new-host-4 aaa]$ cat ashok
[ashok@new-host-4 aaa]$ cat>> ashok
hey this is the first file and yes i am exciterd^C
[ashok@new-host-4 aaa]$
mkdir -p command creates a parent directory if not existed already
for eg: here it creates thesis as a parent directory along with [ashok@new-host-4 ~]$ mkdir -p thesis/chapter1 thesis/chapter2
l[ashok@new-host-4 ~]$ mkdir -p thesis/chapter1 thesis/chapter2
[ashok@new-host-4 ~]$ ls - R thesis
thesis:
chapter1 chapter2
ls -R = listing recursive directories along with the files
cp -R = to copy non empty directories ( - r especially used for doing anything with the non empty touch song{directories
~+ = current working directory
brace expansion: [ashok@new-host-4 globe]$ echo file{a,b}{1,2}
filea1 filea2 fileb1 fileb2
command subsitution:
`(backsticks not single inverted commas ) are quite old ..
now used $() instead of backsticks ..$() can form even nested loops but backsticks cannot
single inverted commas '' cannot redirect command substituition but "" does
processes::
ps command =listing current processes
ps -aux = all processes with columns and includes processes without a controlling terminal
User PID %CPU %mem VSZ RSS TTY STAT START TIME COMMAND
root 39 0.0 0.0 0 0 ? S 01:35 0:00 [rcuob/30]
root 40 0.0 0.0 0 0 ? S 01:35 0:00 [rcuob/31]
root 41 0.0 0.0 0 0 ? R 01:35 0:23 [rcu_sched]
root 42 0.0 0.0 0 0 ? S 01:35 0:20 [rcuos/0]
root 43 0.0 0.0 0 0 ? S 01:35 0:00 [rcuos/1]
also ps-lax = long listing option but avoids username lookup so is faster comparativelyps -
ps -ef also is alos a similiar unix command
Running jobs in the background::
& sign runs th job in background
(%job number ) reconnect to the controlling terminal bringing back to the foreground
No comments:
Post a Comment