execute mkpasswd inside awk

问题

I am trying to use mkpasswd inside awk to compare a file field with encryption (I use Ubuntu):

Execute:

mkpasswd -m sha-512 word abcdefgh

Output:

$6$abcdefgh$SByAdlFKQWuVuMNFUL.ERj1CxsscDs.v6nR2h2cyIkM.PAEUEqaMudTk3I/yfyFeaJY/da4dJto/1wXxMCaok/

Trying:

awk 'mkpasswd -m sha-512 $7 abcdefgh =="$6$abcdefgh$SByAdlFKQWuVuMNFUL.ERj1CxsscDs.v6nR2h2cyIkM.PAEUEqaMudTk3I/yfyFeaJY/da4dJto/1wXxMCaok/"' FS=: file > file1

File:

6:g:g:g:g:g:word1
7:g:g:g:g:g:word
8:g:g:g:g:g:word2

Expected output:

7:g:g:g:g:g:word

回答1:

awk -F':' '
{
    cmd = "mkpasswd -m sha-512 \047" $7 "\047 abcdefgh"
    sha = ( (cmd | getline line) > 0 ) ? line : "N/A" )
    close(cmd)
}
sha == "$6$abcdefgh$SByAdlFKQWuVuMNFUL.ERj1CxsscDs.v6nR2h2cyIkM.PAEUEqaMudTk3I/yfyFeaJY/da4dJto/1wXxMCaok/"
' file > file1

See http://awk.freeshell.org/AllAboutGetline for if/how to use getline, including reading from a pipe as in this case.

来源：https://stackoverflow.com/questions/61436882/execute-mkpasswd-inside-awk