Tag: operating systems

test $a -eq $b

test $a -equal $b

test $a = $b

sh -c test $a == $b

test sleep 1

sleep 1 && echo $0

sleep 1 & echo $!

sleep 1 & echo $$

tree=maple; export tree; sh -c "echo $tree"

tree=maple; export $tree; sh -c "echo $tree"

$tree=maple; echo $tree

export tree = maple; echo $tree

this

that

this other

other

True

False

"$@" takes the entire list and seperates it into special arguments whereas "$*" takes the entire list as one argument with spaces between them

"$*" takes the entire list and seperates it into special arguments whereas "$@" takes the entire list as one argument with spaces between them

Both statements will behave in the same way

None of the above

The getopts command ensures that a parameter is passed for -b option

It signifies that u have to either specify -a option or you have to specify both -b and -c options

The ":" has no effect in the command

The getopts command ensures that a parameter is passed for -a option

grep '\' filename

grep \\ filename

grep '\\' filename

grep "\\" filename

1>

tee

redirect

trap

SHIFT+F11

SHIFT+F10

SHIFT+F1

ALT+F10