/usr/share/doc/m4/examples/
/usr/share/doc/m4/examples
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Edit: /usr/share/doc/m4/examples/join.m4 (583B)
divert(`-1') # join(sep, args) - join each non-empty ARG into a single # string, with each element separated by SEP define(`join', `ifelse(`$#', `2', ``$2'', `ifelse(`$2', `', `', ``$2'_')$0(`$1', shift(shift($@)))')') define(`_join', `ifelse(`$#$2', `2', `', `ifelse(`$2', `', `', ``$1$2'')$0(`$1', shift(shift($@)))')') # joinall(sep, args) - join each ARG, including empty ones, # into a single string, with each element separated by SEP define(`joinall', ``$2'_$0(`$1', shift($@))') define(`_joinall', `ifelse(`$#', `2', `', ``$1$3'$0(`$1', shift(shift($@)))')') divert`'dnl