dynamically list open files for a given process name

lsof -i -n -P | grep -e "$(ps aux | grep node | grep -v grep | awk -F' ' '{print $2}' | xargs | awk -F' ' '{str = $1; for(i = 2; i < NF; i++) {str = str "\\|" $i} print str}')"

us lsof, grep for any pid matching a given name such as "node".

Sample Output

node      24903  rot   11u  IPv4 223478      0t0  TCP *:1337 (LISTEN)
node      24905  rot   11u  IPv4 223478      0t0  TCP *:1337 (LISTEN)
node      25256  rot   16u  IPv4 263849      0t0  TCP *:3000 (LISTEN)
node      25258  rot   11u  IPv4 263849      0t0  TCP *:3000 (LISTEN)
node      25259  rot   11u  IPv4 263849      0t0  TCP *:3000 (LISTEN)
node      25261  rot   11u  IPv4 263849      0t0  TCP *:3000 (LISTEN)
node      25262  rot   11u  IPv4 263849      0t0  TCP *:3000 (LISTEN)
node      25264  rot   11u  IPv4 263849      0t0  TCP *:3000 (LISTEN)

By: hochmeister

2015-02-14 23:24:00

grep awk grep oneliner lsof

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What Others Think

OK, this command is much too long :-) . First, "ps | grep | grep -v grep"... you'd be better using pgrep or pidof pgrep node . Next you use xargs and awk to join up the numbers into one line. paste will do that for you with a choice of separators ... | paste -s -d\| -s means "serial" (on one line) -d delimiter of | (escaped with a backslash) . Then, change grep to -E to use extended regex syntax (this means we can search for (1234|4567) without backslashes. . The final command looks like: lsof -i -n -P | grep -E "($(pgrep node | paste -s -d\|))"

flatcap · 500 weeks and 5 days ago

btw, security by obscurity only works if you don't broadcast that your root user is called 'rot' ;-)

flatcap · 500 weeks and 5 days ago

Save the call to grep and just use lsof's -p option: lsof -p "$(pgrep node | paste -s -d\,)"

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