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String handling i bash



Jeg har et bash script hvor jeg skal have delt en streng, baseret på indholdet 
af en anden streng.

Jeg har en variabel ($latest) der indeholder denne streng:
    /mnt/backup/backups/amanda/2009-09-14_01-09-26

Og en anden variabel ($root) der indeholder denne streng:
    /mnt/backup/backups/amanda/

Jeg vil nu have det 'overskydende' i $latest tildelt en tredie variabel 
($newdir), dvs. denne streng:
    2009-09-14_01-09-26

Hvordan gør man det?

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