[ramu]# cat> data
unix is from multics
unix is multipurpuse
this is ram's unix class
[ramu]# cat data| cut -c 1
u
u
t
[ramu]# cat data| cut -c 3 5 7
cut: 5: No such file or directory
cut: 7: No such file or directory
[ramu]# cat data| cut -c 3,5,7
i s
i s
i s
[ramu]# cat data| cut -c 3,5,7,8
i s
i s
i s
[ramu]# cat data |cut -i [5-8],12
cut: invalid option -- i
Try `cut --help' for more information.
[ramu]# ls -l
total 81060
-rw-r--r-- 1 root root 241 Jan
1 2006 ]
-rw-r--r-- 1 root root 730 Jan
1 2006 v4.c
[ramu]# ls | cut -d " " -f 1 4
cut: 4: No such file or directory
[ramu]# ls | cut -d " " -f 1,4
u4fork.c
v4.c
[ramu]# ls -l | cut -d " " -f 1,4
total
-rw-r--r-- root
[ramu]# ls -l u4fork.c
-rw-r--r-- 1 root root 1785 Jan 1 2006
u4fork.c
[ramu]# shutdown -y -g120 -i0
227 shutdown
-y -g1 -i0
689 cat data
690 cat> data
691 cat data| cut -c 1
692 cat data| cut -c 3 5 7
693 cat data| cut -c 3,5,7
694 cat data| cut -c 3,5,7,8
695 cat data| cut -c [5-8],12
705 ls| cut -d " " -f 1 4
706 ls | cut -d " " -f 1 4
707 ls | cut -d " " -f 1,4
708 ls -l | cut -d " " -f 1,4
709 ls -l u4fork.c
[ramu]# a=100
[ramu]# export a
[ramu]# mkdir ram1
[ramu]# cd ram1
[root@localhost ram1]# echo $a
100
[root@localhost ram1]# sh
sh-3.1# echo $a
100
sh-3.1# ksh
# echo $a
100
[root@localhost ram1]# csh
[root@localhost ~/ram1]# echo $a
100
[root@localhost ~/ram1]# bash
root@localhost ~]#
defining alias for the predefined commands in the
linux operating system
[ramu]# alias a ls -l
now on word you give $a acts as ls -l
[ramu]# alias dayina ls -l
and now $dayina acts as ls -l in th previously i defined ls -l for 'a' and
'dayina'
both wil work for the ls -l and 'a','dayina' acts as
alias for the ls -l
note :- even though i have defined one more alias for
the previously defined alias it will not overwrite insted both will work
to undefine the alias use the below command
[ramu]# unalias a
[ramu]# a
a: Command not found.
Now onwords the remaining alias
dayina will work but 'a' will not work
[ramu]# dayina
total 81120
-rw-r--r-- 1 root root 241 Jan
1 05:51 ]
[ramu]# man compress
verify about the how to compress and uncompress a file ,
No manual entry for compress
[ramu]# set history=2
setting history from unlimisted to only 2
[ramu]# ls -l
[ramu]# date
Sun Jan 1
09:25:09 IST 2006
[ramu]# history
26 9:25
date
27 9:25
history
in the above i have played 3 commands for this only 2
commands are avaliable in the history
[ramu]# w
09:37:28 up 43
min, 1 user, load average: 0.02, 0.07, 0.04
USER
TTY FROM LOGIN@ IDLE
JCPU PCPU WHAT
root
pts/0 :0.0 08:55 1.00s
0.10s 0.00s w
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