Only get hash value using md5sum without filename

Question

I use md5sum to generate a hash value for a file  But i only need to receive the hash value  not the file name   md5  md5sum   my iso file   echo   md5    3abb17b66815bc7946cefe727737d295    iso somefile iso  How can i  strip  the file name and only remain the value

User · Answer

md5sum puts backslash before hash if there is backslash in file name  First 32 characters or anything before first space may not be a proper hash  It will not happen when using standard input  file name will be just -   so pixelbeat s answer will work  but many others will require adding something like   tail -c 32

User · Answer

md5   md5sum  lt   file   tr -d   -

User · Answer

On Mac OS X   md5 -q file

User · Answer

If you need to print it and don t need a newline  you can use   printf   md5sum filename

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You can use cut to split the line on spaces and return only the first such field   md5   md5sum   my iso file    cut -d     -f 1

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Well another way     md5  md5sum   my iso file    awk    print  1

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md5   md5sum  lt  index html   head -c -4

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A simple array assignment works    Note that the first element of a bash array can be addressed by just the name without the  0  index  ie   md5 contains only the 32 chars of the md5sum      md5    md5sum file   echo  md5   53c8fdfcbb60cf8e1a1ee90601cc8fe2

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md5    md5sum    my iso file     md5    md5         remove the first space and everything after it echo    md5

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Well  I had the same problem today  but trying to get file md5 hash when running the find command  I got the most voted question and wrapped it in a function called md5 to run in find command  The mission for me was calculate hash for all files in an folder and output it as hash filename   md5     md5sum  1   awk    printf   s   1       export -f md5 find -type f -exec bash -c  md5   0         -exec echo -n        -print   So  I d got some pieces from here and also from find -exec a shell function

User · Answer

For the sake of completeness a way with sed using regex and capture group   md5   md5sum    my iso file     sed -r  s               1      The regulare expression is capturing everything in a group until a space is reached  To get capture group working you need to capture everything in sed   More about sed and caputer groups here  https   stackoverflow com a 2778096 10926293  As delimiter in sed i use colons because they are not valid in file paths and i don t have to escape the slashed in the filepath

User · Answer

md5  md5sum   my iso file    cut -b-32

User · Answer

Another way   md5   md5sum   my iso file    sed

User · Answer

Another way is to do    md5sum filename  cut -f 1 -d       Cut will split line to each space and return only first field

User · Answer

One way   set --   md5sum  file  md5  1   Another way   md5   md5sum  file   while read sum file  do echo  sum  done    Another way   md5   set --   md5sum  file   echo  1     Do not try that with back-ticks unless you re very brave and very good with backslashes    The advantage of these solutions over other solutions is that they only invoke md5sum and the shell  rather than other programs such as awk or sed   Whether that actually matters is then a separate question  you d probably be hard pressed to notice the difference

[bash] Only get hash value using md5sum (without filename)

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