CODEWITHSUNDEEP
pythonlinuxbashshellrc
zhouzuan2k
zhouzuan2k

Reputation: 167

How to modify rc.local in shell script?

I want to add a line(such as '*/data/mod/myservice start some_parameter*'.) to /etc/rc.d/rc.local file in shell script. If there exists a line start with '*/data/mod/myservice start*', then replace it by new one.

In my script, it execute the next python method.

def excuteCmd(cmd):
    import commands
    output = commands.getoutput(cmd)

def setTask(cmd, installFlag):
    print cmd, installFlag
    excuteCmd('cat /etc/rc.d/rc.local >  oldTask')
    input = open('oldTask','r')
    emptyFile = False
    lines = input.readlines()
    input.close()
    taskNum = len(lines)
    output = open('newTask', 'w')
    if (taskNum  == 0):
            if (installFlag):
                    output.write(cmd + '\n')
    else:
            for i in range(taskNum):
                    if (lines[i].find(cmd) == -1):
                            output.write(lines[i])
            if (installFlag):
                    output.write(cmd + '\n')
    output.close()
    excuteCmd('sudo cat newTask > /etc/rc.d/rc.local')
    excuteCmd('rm -f oldTask')
    excuteCmd('rm -f newTask')

But when i execute sudo cat newTask > /etc/rc.d/rc.local, it raise the following error.

-bash: /etc/rc.d/rc.local: Permission denied

Upvotes: 2

Views: 3096

Answers (2)

eumiro
eumiro

Reputation: 213115

sudo command > filename executes command using sudo (with root privileges), but writes into the filename with user's privileges (insufficient to write to /etc). Imagine it like this:

(sudo command) > filename

The sudo applies to the bracketed part only.

You could run your whole script using sudo.

Upvotes: 2

jeffknupp
jeffknupp

Reputation: 6314

This means that you don't have permission to either write to or delete the file. Also, you won't be able to run the sudo command like that without typing in a password, so ideally the script itself would be run using sudo python scriptname.

Upvotes: 2

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