Error while executing exec.command

[Sharan Guhan]

Hi Experts,

I am relatively new to GOLANG and trying a simple program as below which is failing in fetching the output of a file, which works otherwise on the command prompt:

Lang : GOLANG

OS : Linux/Centos

Problem : Using exec.command to get the output of a certain file

Error: Getting no such file or directory error:

        command = fmt.Sprintf("cat /sys/bus/pci/devices/%s.0/numa_node", name)

2021/03/15 11:55:59 fork/exec cat /sys/bus/pci/devices/0000:19:00.0/numa_node: no such file or directory

exit status 1

However, the same executed on linux prompt works from the same working directory as the code :

[root-v05 ~]# cat /sys/bus/pci/devices/0000:19:00.0/numa_node

0

[root-v05 ~]# 

Please suggest what I may be missing.

Sharan

[Amit Saha]

The exec.Command() expects the arguments to be passed separately. The problem you are having here is that it is thinking your entire command along with the arguments is assumed to be the command to execute.

I would have a look at the documentation for exec.Command

Sharan

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[Axel Wagner]

I would also suggest to just use os.ReadFile, instead of executing `cat`. The latter is pointless overhead and unnecessarily fragile.

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[Sharan Guhan]

Thanks a bunch !! 'ioutils.ReadFIle' did the trick :)

Sharan

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