Hi,
The meaing of ^[0-9] is to exclude the characters specified in the [..], but what is the meaning of ^[0-9][0-9]*$.
The expression is used to get the process information from /proc , it lists all the PIDs of all running processes with some appended text.
but could not understand the meaning.
Jump to PostActually:
[^0-9]excludes characters.
^at the start means the start of the string.
^[0-9][0-9]*$means a string starting with 0-9, followed by any amount of 0-9's (and nothing else).
Actually:
[^0-9]
excludes characters.
^
at the start means the start of the string.
^[0-9][0-9]*$
means a string starting with 0-9, followed by any amount of 0-9's (and nothing else).
ohhh! i understand now,all the directories in /proc are started with a number for the running processes and others to store system information, so they extracting information from only running processes.
Thank a bunch pritaeas.
We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.