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Using lsof on macOS
Using lsof on macOS#
lsof stands for “list open files”. Here are some very basic usage notes for the version that ships with macOS.
Listing processes that have a specific file open#
1~ % lsof /tmp/covid-smaller.db2COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME3Python 17990 simon 6r REG 1,5 747413504 187550734 /private/tmp/covid-smaller.db4Python 17990 simon 12r REG 1,5 747413504 187550734 /private/tmp/covid-smaller.dbNote that this file is opened twice by the same process (Datasette maintains multiple connections to the same SQLite database). The PID column is useful.
In the FD column 6r means “file descriptor 6, open for read access”. w would mean write access, u would mean both.
Files for a specific process#
I removed some of the output here trying to leave the most interesting bits:
1~ % lsof -p 179902COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME3Python 17990 simon cwd DIR 1,5 1344 174186151 /private/tmp4Python 17990 simon txt REG 1,5 49400 163507251 /usr/local/Cellar/python@3.9/3.9.7/Frameworks/Python.framework/Versions/3.9/Resources/Python.app/Contents/MacOS/Python5Python 17990 simon txt REG 1,5 3632512 163507083 /usr/local/Cellar/python@3.9/3.9.7/Frameworks/Python.framework/Versions/3.9/Python6...7Python 17990 simon txt REG 1,5 50840 152019254 /usr/local/Cellar/datasette/0.58.1/libexec/lib/python3.9/site-packages/markupsafe/_speedups.cpython-39-darwin.so8...9Python 17990 simon txt REG 1,5 1069536 148927587 /usr/local/Cellar/sqlite/3.36.0/lib/libsqlite3.0.dylib10Python 17990 simon txt REG 1,5 24552 179047672 /usr/local/Cellar/datasette/0.58.1/libexec/lib/python3.9/site-packages/bpylist/bplist.cpython-39-darwin.so11Python 17990 simon txt REG 1,5 1572480 1152921500312757159 /usr/lib/dyld12Python 17990 simon 0u CHR 16,5 0t94656 6931 /dev/ttys00513Python 17990 simon 1u CHR 16,5 0t94656 6931 /dev/ttys00514Python 17990 simon 2u CHR 16,5 0t94656 6931 /dev/ttys00515Python 17990 simon 3u KQUEUE count=0, state=0xa16Python 17990 simon 4u unix 0x67a396d5b54b61cb 0t0 ->0x67a396d5b54b522b17Python 17990 simon 5u unix 0x67a396d5b54b522b 0t0 ->0x67a396d5b54b61cb18Python 17990 simon 6r REG 1,5 747413504 187550734 /private/tmp/covid-smaller.db19Python 17990 simon 7u KQUEUE count=0, state=0xa20Python 17990 simon 8u unix 0x67a396d5b54b68d3 0t0 ->0x67a396d5b54b561321Python 17990 simon 9u unix 0x67a396d5b54b5613 0t0 ->0x67a396d5b54b68d322Python 17990 simon 10u IPv4 0x67a396d59c718b2b 0t0 TCP localhost:8422 (LISTEN)23Python 17990 simon 12r REG 1,5 747413504 187550734 /private/tmp/covid-smaller.dbThe column with FD=cwd, TYPE=DIR shows the working directory for the process.
The TYPE=IPv4 one is interesting, it shows that we are listening on localhost:8422.
PID listening on a port#
To find out which process is listening on a specific port, use lsof -i :8000. For example:
1~ % lsof -i :80002COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME3Python 23862 simon 3u IPv4 0x78af109648024857 0t0 TCP localhost:irdmi (LISTEN) Using lsof on macOS
https://mranv.pages.dev/posts/using-lsof-on-macos/