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What's wrong after assign it to a variable ?

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http://www.unix.com – Code: root@intel_5500_server:/tmp# ID_GUEST="01:00.0" root@intel_5500_server:/tmp# echo $ID_GUEST|sed 's%:%\\:%g' 01\:00.0 root@intel_5500_server:/tmp# ID_GUEST_P=`echo $ID_GUEST|sed 's%:%\\:%g'` root@intel_5500_server:/tmp# echo $ID_GUEST_P 01:00.0 root@intel_5500_server:/tmp# if I assign it to variable, \ will be missing (HowTos)