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Question or issue on macOS:
I use a specific ps command namely
which gives me a result like
All i want to do is to just print these numbers like 15.1 and 10.0 without the headers. I tried to use the ‘cut' . But it seems to work on every line.
i.e
gives something like
How to get just the numbers without the headers ?
How to solve this problem?
Solution no. 1:
Using awk:
Using sed:
Solution no. 2:
The BSD (and more generally POSIX) equivalent of GNU's ps --no-headers is a bit annoying, but, from the man page:
-o Display information associated with the space or comma sepa-
rated list of keywords specified. Multiple keywords may also
be given in the form of more than one -o option. Keywords may
be appended with an equals (`=') sign and a string. This
causes the printed header to use the specified string instead
of the standard header. If all keywords have empty header
texts, no header line is written.
So:
That's it.
If you ever do need the remove the first line from an arbitrary command, tail makes that easy:
Or, if you want to be completely portable:
The cut command is sort of the column-based equivalent of the simpler row-based commands head and tail. (If you really do want to cut columns, it works… but in this case, you probably don't; it's much simpler to pass the -o params you want to ps in the first place, than to pass extras and try to snip them out.)
Meanwhile, I'm not sure why you think you need to eval something as the argument to echo, when that has the same effect as running it directly, and just makes things more complicated. For example, the following two lines are equivalent:
Solution no. 3:
Use ps --no-headers:
Hoard Header Mac Os 11
–no-headers print no header line at all
or use:
Solution no. 4:
Already picked the winner. Drats…
Hoard Header Mac Os Catalina
If you're already using the -o parameter, you can specify the headings for the particular columns you want to print by putting an equal sign after the name, and the column name. If you put a null string, it'll print no headings:
With standard headings (as you had):
With custom headings (just to show you how it works):
With null headings (Notice it doesn't even print a blank line):
Hope this helps!
