Get the canonical, absolute path given a relative and/or noncanonical path

readlink -f ../super/symlink_bon/ahoy
readlink -f accepts a relative, noncanonical path and emits the corresponding canonical, absolute path.
Sample Output
/tmp/foo/bar/baz/super/bon/bon/ahoy

11
By: rbs
2009-06-23 17:46:08

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  • Retrieve absolute path name from relative path Show Sample Output


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    readlink -f myfile.txt
    AlBeBack · 2011-02-07 14:28:28 0
  • Sometimes you need the full path to your script, regardless of how it was executed (which starting directory) in order to maintain other relative paths in the script. If you attempt to just use something simple like: STARTING_DIR="${0%/*}" you will only get the relative path depending on where you first executed the script from. You can get the relative path to the script (from your starting point) by using dirname, but you actually have to change directories and print the working directory to get the absolute full path. Show Sample Output


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    STARTING_DIR=$(cd $(dirname $0) && pwd)
    bbbco · 2011-11-30 17:35:15 2
  • Will convert relative paths into absolute paths. Show Sample Output


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    realpath -s <filename>
    kalaxy · 2011-03-02 23:40:57 0
  • Pass the files path to finfo(), can be unix path, dos path, relative or absolute. The file is converted into an absolute nix path, then checked to see if it is in-fact a regular/existing file. Then converted into an absolute windows path and sent to "wmic". Then magic, you have windows file details right in the terminal. Uses: cygwin, cygpath, sed, and awk. Needs Windows WMI "wmic.exe" to be operational. The output is corrected for easy... finfo notepad.exe finfo "C:\windows\system32\notepad.exe" finfo /cygdrive/c/Windows/System32/notepad.exe finfo "/cygdrive/c/Program Files/notepad.exe" finfo ../notepad.exe Show Sample Output


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    finfo() { [[ -f "$(cygpath "$@")" ]] || { echo "bad-file";return 1;}; echo "$(wmic datafile where name=\""$(echo "$(cygpath -wa "$@")"|sed 's/\\/\\\\/g')"\" get /value)"|sed 's/\r//g;s/^M$//;/^$/d'|awk -F"=" '{print $1"=""\033[1m"$2"\033[0m"}';}
    lowjax · 2013-12-30 07:47:41 0

What Others Think

handy
thebillywayne · 469 weeks and 2 days ago
Very useful
jgc · 453 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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