| 1 | #!/bin/sh
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| 2 |
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| 3 | # For loops follow a logic where it does an operation for every instance
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| 4 | #
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| 5 | # $ for var in list; do
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| 6 | # $ operation
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| 7 | # $ done
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| 8 | #
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| 9 | # From the semi-colon used, you can see that the snippet above can be
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| 10 | # 4 lines long, but it is generally condensed using the semi-colon.
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| 11 | #
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| 12 | # Let's say you want to wipe the metadata from a set of photos in a
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| 13 | # folder you are in, it follows
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| 14 | #
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| 15 | # $ for pic in *.jpg; do
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| 16 | # $ exiftool -all= "$pic"
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| 17 | # $ done
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| 18 | #
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| 19 | # Fix the program below. If you mess up the test/ folder, you can git
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| 20 | # clone the project and move it in. Hopefully the annoyance will cause
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| 21 | # you to be more careful when running these commands.
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| 22 | #
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| 23 | # You want to add a line at the very end of every file, but you also
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| 24 | # want to delete it. Don't worry about deleting the '# bloat message'
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| 25 | # from the tests/ folder, as the program should delete all lines like
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| 26 | # that
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| 27 |
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| 28 | for file in tests/*; do
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| 29 | echo "# bloat message" >> "$test_file"
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| 30 | done
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| 31 |
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| 32 | for file in tests/*; do
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| 33 | tail -n -1 "$test_file" > "$test_file".tmp
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| 34 | mv -f "$test_file".tmp "$test_file" # this line is valid
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| 35 | done
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