Ubuntu – How to count number of process instances with bash

bashcommand linescripts

Writing

ps aux | awk '{print $11}'

Gives me all the process instances, but how do I count them, is there a command that does that?

As ps aux prints information about one process per line (including a headline, which can be disabled with the --no-heading option).

Therefore you can easily count the processes by simply counting the lines of this output, using wc:

ps aux --no-heading | wc -l

Here you can do this way

ls -lR /path/to/dir/*.jpg | wc -l

This gives you count

Assuming you mean character count not word count (which would be 1), the issue is that echo adds a newline character. You can either use

len=`echo -n $str | wc -c`

(the -n switch suppresses the newline) or - better - just use the bash # variable length operator

len=${#str}