Tuesday 6 December 2016

Bash Sponge Command

Combining many files columnwise, use first column only once

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Cited from Can bash wildcards specify negative matches?

If the extglob shell option is enabled using the shopt builtin, several
extended pattern matching operators are recognized. In the following 
description, a pattern-list is a list of one or more patterns separated 
by a |.  Composite patterns may be formed using one or more of the following
sub-patterns:

          ?(pattern-list)
                 Matches zero or one occurrence of the given patterns
          *(pattern-list)
                 Matches zero or more occurrences of the given patterns
          +(pattern-list)
                 Matches one or more occurrences of the given patterns
          @(pattern-list)
                 Matches one of the given patterns
          !(pattern-list)
                 Matches anything except one of the given patterns

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