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1 # PSRE README
2
3 Psre is short for **Process Snapshot Regex**. Essentially it is a simple
4 interface to quickly find PIDs of processes based on a regex match on the
5 `cmdline` in `/proc`. The normal operation is to run `ps` with any number of
6 flags, piped to any number of stream processors to extract matching process
7 IDs.
8
9 With `psre`, the command can be for example, `psre 'reg.*ex'`, to list all
10 processes with `reg` followed anywhere by `ex`. If the user wants to print a
11 list of the commands with the processes, the `-c,--cmdline` option can be
12 passed and the cmdline value will be printed next to the pid following a tab
13 character for easier splitting.
14
15 **Note** that when using `-c,--cmdline`, the original cmdline files in `/proc`
16 null-byte delimit the arguments of a command, leaving it only partially
17 printable. `psre` replaces those null bytes with the ascii space char (`0x20`
18 or `32 dec`) so the full cmdline is printable.
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