CODEWITHSUNDEEP
rlinuxdockerubuntu
Bogaso
Bogaso

Reputation: 3318

R's pipe() function and Ubuntu console gives different result

I am using R in my Ubuntu machine with latest configuration

In R, I get below result:

> read.fwf(pipe('ps -ef | grep /var/lib/docker/'), width = 60)
                                                            V1
1 root     29155 29151  0 11:18 pts/0    00:00:00 sh -c ps -ef
2 root     29157 29155  0 11:18 pts/0    00:00:00 grep /var/li

However in Ubuntu console I get different result

ps -ef | grep /var/lib/docker/
root     29150  2509  0 11:17 pts/0    00:00:00 grep --color=auto /var/lib/docker/

I wanted R to fetch PID of /var/lib/docker/, which is according to Ubuntu 2509

Can anyone help me understand why I am getting different result and how to fetch the PID number correctly?

Thanks,

Upvotes: 1

Views: 44

Answers (1)

G. Grothendieck
G. Grothendieck

Reputation: 270055

Use ps() in the ps package. This function outputs a data.frame with the process id information.

library(ps)

pid_df <- ps()
pid_df$pid[grep("docker", pid_df$name)]

or in one line:

subset(ps(), grep("docker", name))$pid

Upvotes: 0

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