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annotate bin/intersection @ 140:0a447db5cf1c

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move to ec164.guest
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Tue, 19 Oct 2021 12:55:30 +0000
parents 464d2dfb99c9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Henry S. Thompson <ht@inf.ed.ac.uk>
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1 #!/bin/sh
Henry S. Thompson <ht@inf.ed.ac.uk>
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2 # Output intersection (or, with -d, difference) of two files, line by line
Henry S. Thompson <ht@inf.ed.ac.uk>
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3 # No detection or special treatment of duplicates
Henry S. Thompson <ht@inf.ed.ac.uk>
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4 # Usage: intersection [-d] s1 s2
Henry S. Thompson <ht@inf.ed.ac.uk>
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5 # In the case of difference, which is ordered, interpretation is s1 - s2
Henry S. Thompson <ht@inf.ed.ac.uk>
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6 if [ "$1" = "-?" ]
Henry S. Thompson <ht@inf.ed.ac.uk>
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7 then
Henry S. Thompson <ht@inf.ed.ac.uk>
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8 echo "Usage: intersection [-d] s1 s2"
Henry S. Thompson <ht@inf.ed.ac.uk>
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9 exit 1
Henry S. Thompson <ht@inf.ed.ac.uk>
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10 fi
Henry S. Thompson <ht@inf.ed.ac.uk>
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11 if [ "$1" = "-d" ]
Henry S. Thompson <ht@inf.ed.ac.uk>
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12 then
Henry S. Thompson <ht@inf.ed.ac.uk>
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13 shift
Henry S. Thompson <ht@inf.ed.ac.uk>
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14 fgrep -x -v -f "$2" "$1"
Henry S. Thompson <ht@inf.ed.ac.uk>
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15 else
Henry S. Thompson <ht@inf.ed.ac.uk>
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16 fgrep -x -f "$1" "$2"
Henry S. Thompson <ht@inf.ed.ac.uk>
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17 exit 0
Henry S. Thompson <ht@inf.ed.ac.uk>
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18 fi
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