learning shell scripting

[milonix]

i wrote this script, and everytime i run the script the code deletes and i want to know why

EDIT: i also chmod 755 if anyone wanted to know

$ cat > ispostive
#!bin/sh
#
# Script to see whether argument is postive
#
if test $1 -gt 0
then
echo "$1 number is postive"
fi

just so everyone knows i just started to learn shell scripting

[ghostdog74]

the code deletes? u mean it did not get saved as file "ispositive"? how did you end you session affter you typed in those lines? using cat, to end the script you should type ctrl-d. a suggestion is to use an editor like vi or emacs etc to create your script.

[milonix]

the code deletes? u mean it did not get saved as file "ispositive"? how did you end you session affter you typed in those lines? using cat, to end the script you should type ctrl-d. a suggestion is to use an editor like vi or emacs etc to create your script.

umm i dont know those editer's i was useing gedit.. i guess i should learn how to use vi i guess?

[ghostdog74]

umm i dont know those editer's i was useing gedit.. i guess i should learn how to use vi i guess?

no its fine. use gedit, type in your script , save it as "ispositive" (or other names) , chmod it if necessary and you can then run the script with an argument. it should be fine.

[oz]

i guess i should learn how to use vi i guess?

If you should decide that you do want to learn vim, just run the vimtutor command for a quick lesson.

[milonix]

i was following Linux Shell Scripting Tutorial (LSST) v1.05r3 and he use's $ cat > filename.. at the top of code so i thought i had to put that but it look's like thats just a command to start the file am i wrong?

[ghostdog74]

i was following Linux Shell Scripting Tutorial (LSST) v1.05r3 and he use's $ cat > filename.. at the top of code so i thought i had to put that but it look's like thats just a command to start the file am i wrong?

when you do : cat > filename on the shell, cat takes in standard input from the command line, ie whatever you type. to stop typing, you give ctrl-d to cat and it will save what you type to filename. this is essentially the same as what you do with gedit (or other editors).
However, if you just do a cat:

# cat
this is first line
this is first line

cat will echo what you type on the screen (stdout).
please look at the cat man page for more details.

[milonix]

Thanks for everyone's help