They are process IDs given to processes. A PID can vary from 0 to 65535.
2. How do you send a mail message to somebody?
mail somebody@globalguideline.com -s ‘Your subject' -c ‘ cc@globalguideline.com‘
7. How do you search for a string inside a given file?
grep string filename
11. How do you find out what's your shell?
echo $SHELL
12. How do you fire a process in the background?
./process-name &
13. How do you refer to the arguments passed to a shell script?
, and so on. {xtypo_info}$1, $2 and so on. $0 is your script name.{/xtypo_info} is your script name.
14. What's the conditional statement in shell scripting?
if {condition} then … fi
15. How do you do number comparison in shell scripts?
-eq, -ne, -lt, -le, -gt, -ge
16. How do you test for file properties in shell scripts?
-s filename tells you if the file is not empty, -f filename tells you whether the argument is a file, and not a directory, -d filename tests if the argument is a directory, and not a file, -w filename tests for writeability, -r filename tests for readability, -x filename tests for executability
17. How do you do Boolean logic operators in shell scripting?
! tests for logical not, -a tests for logical and, and -o tests for logical or.
19. What's a way to do multilevel if-else's in shell scripting?
if {condition} then {statement} elif {condition} {statement} fi
20. How do you write a for loop in shell?
for {variable name} in {list} do {statement} done
