I hv a crontab job (script) that can be run normally , now I try to run it on the shell but can't be run , can advise what is difference between run a script on crontab and run it manually ? is it the difference of system enviornment ?thx

I tried to fix it by below method ,

I write a script /tmp/script1


#vi /tmp/script1
rlogn localhost -l cron_usr

#vi ~cron_usr/.profile
my_script

what I want is to make the crontab job (/tmp/script1)
will login the system and login as cron_usr .
If I run this script manually , it is OK , but if I run it by crontab job , it is not work , so I think run manully and by crontab is different , can advise how can I make it work ?

thx

for simply , I just want to setup a crontab job , when run this job , it will login the system ( just like a telnet , ssh etc ) , is it possible ? thx

then sudo gedit /etc/crontab
with

thx reply ,
I am not too clear what is this function , I have already tried it , but it pop the below message , what is wrong ? please advise.

sudo gedit /etc/crontab

(gedit:11009): Gtk-WARNING **: cannot open display:

it's certainly the X protection (it depends on the distro)
should work (maybe, but it is not so secured. Then xhost -)

try with vim, joe, or nano (apt-get install vim nano joe) without X.

with VIM :
iiii to insert
ESC :wq to save/exit