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mklm
on Feb 14, 2019
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Problem solving with Unix commands
Although -w is supported by both GNU and BSD versions of `seq', BSD's ignores leading zeros in input. Thus a more portable approach is:
comm -1 -3 <(ls *_A.csv | sed 's/_.*$//') <(seq -f %04.f 500) | sed 's/^0*//'
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