gksudo doesn't act like sudo for 'string' >> file

Question

I'm trying to do a two-lines-script to temporary set a specific nameserver. Therefore I just output 'nameserver XXX.XXX.XXX.XXX' to the /etc/resolv.conf file, because it gets overwritten next time anyways. The thing is, when I try to ask for the password via gksudo, I get an error because it tries to output the gksudo result to the file.

UPDATE:

My current file is now:

#!/bin/sh
gksudo "bash -c \"echo 'nameserver XXX.XXX.XXX.XXX' >> /etc/resolv.conf\""

The command with sudo instead of gksudo and without the "" and \\ works as it should. Remains how to get it into the GUI prompt.

chaos · Answer 1 · 2015-01-13T18:06:44.120

3

You were very close, try that:

#!/bin/sh
gksudo "bash -c \"echo 'nameserver XXX.XXX.XXX.XXX' >> /etc/resolv.conf\""

edited Jan 13 '15 at 18:06

answered Jan 13 '15 at 15:33

chaos

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Unfortunately, gksudo takes the -c now as one of its options. :-/ – Peter Nerlich Jan 13 '15 at 16:09
@PeterNerlich I edited the answer, please try again – chaos Jan 13 '15 at 18:07
Well, it does now kind of what it should, it only somehow fails without returning an error... It works with sudo and without the "" and \ all around, but gksudo won't. Strange... – Peter Nerlich Jan 13 '15 at 19:52

Rishabh · Answer 2 · 2015-01-13T16:02:54.877

As you can read here - http://sernaonubuntu.wikidot.com/command-line:piping-and-directing-output the >> symbol appends the result of the command to the file

The result of 'nameserver XXX.XXX.XXX.XXX' command is.. well command not found :P

What comes to the rescue is the echo command (as @chaos rightfully said) which echoes the text and that result can be piped to the file

Though you can use a simpler version of his script

#!/bin/sh
gksudo echo 'nameserver XXX.XXX.XXX.XXX' >> /etc/resolv.conf

Michael · Answer 3 · 2015-04-11T12:41:13.037

-4

Have you tryed this in sted type in this:

    #!bin/sh
           Case (nameserver) in
                 /bin/sh
                 nameserver = XXX.XXX.XXX XXX >>
                 gksudo 'echo' nameserver >>
                 resolvconf XXX.XXX.XXX.XXX >>
           endl

and it might work fine this way.

edited Apr 11 '15 at 12:41

answered Jan 13 '15 at 15:42

Michael

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Which syntax is this? Surely not any shell? – Rmano Jan 13 '15 at 15:43
@Rmano same language as this one. – muru Jan 13 '15 at 15:44

gksudo doesn't act like sudo for 'string' >> file

3 Answers3