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Discard output from the cd command when followed by pwd #16238
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10 changes: 5 additions & 5 deletions
10
circle-mlir/circle-mlir/tools/one-import-onnx-ext/one-import-onnx-ext
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is this really needed?
what is the problem?
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I've just checked this particular one-liner and you are right, everything is OK here!
So, here is the detailed explanation what is going on, and why I've raised this PR:
Create some directory in your
$HOME, e.g.mkdir -p $HOME/dir/subdir, then create a bash script in it (and make it executable), like this:Then run this script:
Now set the
CDPATHenv variable and run the script again:In the second test, the
cd "$(dirname "${BASH_SOURCE[0]}")"prints the destination directory/home/arkq/dir/subdir, so the entire one-liner gets duplicated output. HOWEVER, if the one-liner usesreadlink -f, e.g.:SOURCEDIR="$(cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")" && pwd)"thecdgets the absolute path, and in such case the destination directory is not printed!So, now the question which approach is better, discarding output or using
readlink -f? I think that discarding output is safer, because resolving symlinks willcdyou into different directory structure if somewhere along the path symlink was used. Then, relative paths (ones with ../../../) will no longer work.I will update this PR to account work this finding. Also I will split this PR info separate ones for different parts of this repo.
Many thanks for the review! :)