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lang-c
datewill say2013.06.14.12.00.02, andsedwill output2013.6.14.12..2. Note that the00minutes field disappears completely, leaving two adjacent dots. This is probably not what the user wants. To do this correctly in GNUsed, usesed -E -e 's/^0?//' -e 's/\.0?/./g'(to delete zero or one0). Or, to do it portably in GNU or POSIXsed, usesed -e 's/^0//' -e 's/\.0/./g'(to delete one0, or not; it’s OK if the substitution simply fails when there isn’t a leading0). … (Cont’d)goption is useless on a substitute that’s anchored with^or$, since it cannot happen more than once.