On 27-May-2002 Squirrel wrote:
> apt_dest()
> {
> local m="$3"
> m="debootstrap.invalid"
> printf "$APTSTATE/lists/"
> echo "${m}_$4"|sed 's/\//_/g'
> }
>
> apt_dest rel woody file:/instmnt dists/woody/Release
each argument is passed in as a number parameter. So $3 is the third
argument.
>
> what's the meaning of the above program,especial of "echo "${m}_$4"|sed
> 's/\//_/g"?
>
sed is a utility which reads input and does modifications to it then outputs it.
thr s///g means "do a string substitute with this regex on all occurances of
the regex". The item in between the first // is "\/" which is a backslash
escaped, the item in the second // is '_'. So this says send the fourth
command line parameter into sed, changing all backslashes into underscores.
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