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yes , you get it..
in the crontab you should give crond the full path .

my suggestion：
ls|grep -cE "aaa"
regard.

u may have a try byping google.com
do u got the answer?
I think u didnt config the /etc/resolv.conf

use google instead of the question.

why use the parameter -z ?
It will do compress by -z ,and its the reason for what u want .

vim filename
vim ***
:%s/MoreFlag/MorePACFlag/g

why don't you try "ls |grep **" then you don't have to do this..

and if you have to do so .

you can try "*** | awk '{print $9}'"

U can set a default shell for users by edit "/etc/default/useradd"(CentOS 5.4)

[root@**** ~]#more /etc/default/useradd
# useradd defaults file
GROUP=100
HOME=/home
INACTIVE=-1
EXPIRE=...

OK,could you tell the way you change SHELL.
you can use
env|grep SHELL
to see what the SHELL is.
and use
pstree
to see the tree structure of your SHELL.
for me it's like this...

so ,can you use "touch" to change the access time?

try "diff -u A B"
A(B) stands for the files you wanna to compare with

hello I cant tell apart ,but I think you can get help by the following way:
info "|"
also , you can deeply about the use of "|"