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So should I do $@ instead or should I do $1 but would that do if there are multiple names on the command line like the assignment says like if there is
sali1206
fake329
unreal896

and I do ...

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1. The problem statement, all variables and given/known data:

Write a...

I am trying to write a script to send a customized mail message to the users listed on the command line by login name only if they are logged in. If no users are listed on the command line an error ...

I have a script where I have the command

sed "s/$search_string/$replace_string/g" $backup

However I want a command to correct the original file $backup as well as creating another file with the...

Thanks ahamad and agama. I just used the for loop because it was there already and since I am using bash it was giving me an unknown == operator error but I changed that to just = and it worked!...

This is an assignment where we were supposed to create a script to get an orginal string and replace it with another. However when I run my script (change-lines), it says

./change-lines: cannot...

I see 4..counting a space 5 ..why would you count the space..there is no space in the original file after -
Sorry I am a newbie.

this works thanks!

This works except that the column with the area code is $3 not $2 so when I substituted $2 for $3 - the command works !!
Trying to understand this tho...I know $3=substr means substitution in column...

is there a way to do this using sed?

hi all,

I am having trouble finding the right string for this - I dont know whether to use awk or sed..

If I have a file with alot of names and phone numbers like this
McGowan,Sean ...

sorry, yes both the ones above work....Since I am such a big fat NOOB I was using regular quotes instead of backquotes...and I have been trying to get this right since yestaurday ..LOL...and such a...

no, none of these work so far. I think it will have to be a combination.
Maybe if i get the username first by whoami and then piped to grep for that username in /etc/passwd...is that possible?

How would I grep for password file entry without using
grep 'username' /etc/passwd?
perhaps with who?
I want to create alias that will find the password file entry regardless of the user who is...

the user password file entry in /etc/passwd looks like
Name : Password : UserID : PrincipleGroup : Gecos : HomeDirectory : Shell
this is the format i am trying to accomplish sp if a user was to...

How would I grep for password file entry without using
grep 'username' /etc/passwd?
perhaps with who?
I want to create alias that will find the password file entry regardless of the user who is...