Distinguish from the contents of a file which are the processes and print them
 

I have a file with name procs and the following content:

date
httpd
ps
tty
.....

how can i recognize which of these names are processes names and print only them

My solution is

for i in procs
do
if [ -p $i]
echo $i
done

but is does not work. I would appreciate any help.

Try using grep (man grep on how to use) for searching the file.

I use the following from the command line to find a set of characters in a file:
$ cat <filename> | grep ps

Something line:

for i in $( cat procs)
do
if ps -C $i > /dev/null
echo $i
done

Why do you consider this a solution? What do you think should
be happening, what do the man-pages for the programs involved
in your "solution" suggest they do, what is the outcome of your
attempt?


Do your own homework.

"It's the syntax, stupid!" :)

Seriously, tell me the 3 CLI ways to get documentation on a command, & I will tell you which one to use to solve your problem.


Welcome to LQ

Welcome to LQ. Yes, I mean it. I know others have been pretty harsh on you for posting your homework, but in the process they have provided much amusement for the rest us: Find all threads started by jianelisj

Thank you for the wonderful light start to my day.

Proves the old adage: "No one is completely worthless -- you can always be used as a horrible example.

For the moment, you are the horrible example; however, in amongst negative commentary are the seeds of reform -- re-read & learn.

Surprisingly, one thing no one has suggested is Raymond & Moen's "How To Ask Questions the Smart Way" found here or here. (Both of the authors maintain public copies.)

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