Bash Prompt HOWTO:
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# 11.9. Number of Processes

`ps ax | wc -l | tr -d " "` OR `ps ax | wc -l | awk '{print $1}'` OR `ps ax | wc -l | sed -e "s: ::g"`. In each case, `tr` or `awk` or `sed` is used to remove the undesirable whitespace.

Relative speed: any one of these variants takes about 0.9 seconds on an unloaded 486SX25.

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