#3 - to find the PID Or simply use: pidof

Opps!! there is typo; it should be: pidof

1. ./sample.sh &> output.txt :- to capture output and error message suppose sample.sh have below script: #!/bin/bash cat file1 cp file2 file3 lets assume there's no file2 exists in the current directory, returns an error message 2. from any current directory run the below line by line. for i in `find -maxdepth 1 -type f` do cat $i >> output.txt done in for loop i stores all the files (type f means normal file type) in a current directory (maxdepth 1), suppose you want to consider all subdirectory files remove this part. then redirecting all the files to output.txt 3. ps -ef | grep -i "*process name* ps displays running processes, -e utility here displays all the processing shell processes without ignoring any process, f gives the full text/all info of processes. if you are not sure on the exact process name give * as above by giving part of the process name that you can remember

#3 I disagree, more like ps aux |awk '$0 ~ /ProcessName/ && $0 !~ /awk/ {print $2}' If you want the PID

#3 To find the PID: pgrep -x