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Simulating piping one command to another using Python
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| #!/usr/bin/env python3 | |
| import subprocess | |
| # This performs the equivalent of `ps -axm -o rss,comm | sort -rn -k 1 | head -n 20` | |
| number_of_entries = 20 | |
| cmd1 = ['/bin/ps', '-axm', '-o', 'rss,comm'] | |
| cmd2 = ['sort', '-rn', '-k', '1'] | |
| cmd3 = ['head', '-n', str(number_of_entries)] | |
| p1 = subprocess.Popen(cmd1, stdout=subprocess.PIPE) | |
| p2 = subprocess.Popen(cmd2, stdin=p1.stdout, stdout=subprocess.PIPE) | |
| p3 = subprocess.Popen(cmd3, stdin=p2.stdout, stdout=subprocess.PIPE) | |
| output = p3.stdout.read().decode() | |
| print(output) |
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This specific example is using the MacOS Sequoia version of
ps.