Assign variables value to a variable

Question

Using the command line, I've defined two variables

set a = 5
set b = 5

In addition I've set another variable, c, in which I am trying to assign a's and b's value.

I tried -

set c = $($a+$b)

But I've got Illegal variable name.

I tried -

set c
c = $($a+$b)

But I've got Illegal variable name., again.

Why are you trying to use `set`? Where did you get the `$($a+$b)` syntax? None of this looks like bash code. — melpomene, May 07 '17 at 08:05
The following might help: http://tldp.org/LDP/abs/html/arithexp.html — Nir Alfasi, May 07 '17 at 08:07
@AlexGoft Why are you asking about `bash` if you're actually using `tcsh`? — melpomene, May 07 '17 at 08:56

score 2 · Accepted Answer · answered May 07 '17 at 09:54

You may try following way:

    @ a = 4
    @ b = 5
    @ c = $a + $b

    echo $c
    9

Don't forget @, it's used instead of 'set'

PS. Never worked in tcshso please take my answer/suggestion with a pinch of salt.

score 1 · Answer 2 · answered May 07 '17 at 08:07

1

Change your script to:

a=5
b=4

c=$(($a + $b))
# test
echo $c
# prints 9

Note that double parenthesis and the removal of the set keyword.

answered May 07 '17 at 08:07

Maroun

But if im trying to write in command line `a=5`, i get `a=5: Command not found.`. That's why i used set. – Alex Goft May 07 '17 at 08:13
@AlexGoft Set doesn't do what you think. Also, maybe you had a space between the left and the right sides of the "=", which shouldn't be there. – Maroun May 07 '17 at 08:14
1

@MarounMaroun Turns out the question is actually about tcsh, not bash. – melpomene May 07 '17 at 08:58
@melpomene I think in this case it should be posted as a new question, since this one already has an answer and was tagged bash for a while. – Maroun May 07 '17 at 09:09

JDQ · Answer 3 · 2017-10-14T20:51:39.743

1

set a = 5
set b = 5
set c = `expr $a + $b`

edited Oct 14 '17 at 20:51

answered Oct 14 '17 at 20:46

JDQ

3 Answers3