Bad : modifier in $ (/)

Question

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/my/lib

error:

Bad : modifier in $ (/)

echo $SHELL

/bin/tcsh

I want to add my library to LD_LIBRARY_PATH variable. But Gives the above error.

Then you should probably use tcsh syntax. – Ignacio Vazquez-Abrams Dec 05 '16 at 06:11 — Ignacio Vazquez-Abrams, Dec 05 '16 at 06:11
How can I use it @IgnacioVazquez-Abrams – elif mutlu Dec 05 '16 at 06:13 — elif mutlu, Dec 05 '16 at 06:13

score 13 · Accepted Answer · edited May 23 '17 at 12:08

13

As Ignacio Vazquez-Abrams, pointed out you need to set environment variable in tcsh syntax as

setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:"/home/my/lib"

edited May 23 '17 at 12:08

Community

1
1

answered Dec 05 '16 at 06:15

Inian

80,270
14
142
161

1

To clarify what's going on here: tcsh allows "variable modifiers" in the form of `$varname:modifier`, so if your variable name is followed by a `:text` you need to use the `${..}` syntax to make it clearer that the `:text` isn't part of the variable modifier. – Martin Tournoij Dec 05 '16 at 14:28

score 4 · Answer 2 · answered Dec 05 '16 at 09:15

# Assign empty string to LD_LIBRARY_PATH, if the variable is undefined
[ ${?LD_LIBRARY_PATH} -eq 0 ] && setenv LD_LIBRARY_PATH ""

setenv LD_LIBRARY_PATH "${LD_LIBRARY_PATH}:/home/my/lib"

Checking if the Variable is Defined

If the variable was not previously defined, the simple setenv LD_LIBRARY_PATH value command will fail with an error like LD_LIBRARY_PATH: Undefined variable.. To prevent this, check the value of ${?LD_LIBRARY_PATH} (substitutes the string 1 if name is set, 0 if it is not) and set a default value as it is shown above.

Using Double Quotes

Also note the use of double quotes. Suppose the variable contains spaces, e.g.:

setenv LD_LIBRARY_PATH "/home/user with spaces/lib"

Then the command without quotes:

setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:/home/my/lib

will fail with the following error:

setenv: Too many arguments.

In double quotes, however, the value is passed to the command as a single word.

Bad : modifier in $ (/)

2 Answers2