On Wed, Nov 14, 2007 at 01:11:12PM +0800, 龙海涛 wrote: > it works. > 3x very much. > > On Tue, 2007-11-13 at 21:51 -0700, Bob Proulx wrote: > > > 龙海涛 wrote: > > > i want to store the current working dir to a variable, i write > > > > The most common way to save the present working directory to a > > variable would be to use the $(...) form. > > > > test=$(pwd) > > echo $test
By the way, the variable "$PWD" has the same current directory value as "$(pwd)" . Assigning with test=$PWD can be quite a bit faster than using $(pwd) to execute the pwd builtin. $ s=$SECONDS;for (( i=1;i<10000;i++ )) ;do d=$(/bin/pwd);done;echo $(($SECONDS-$s)) 23 $ s=$SECONDS;for (( i=1;i<10000;i++ )) ;do d=$(pwd);done;echo $(($SECONDS-$s)) 8 $ s=$SECONDS;for (( i=1;i<10000;i++ )) ;do d=$PWD;done;echo $(($SECONDS-$s)) 0 The speed difference probably doesn't matter for most situations. -- Mike Stroyan <[EMAIL PROTECTED]>
