變量賦值的疑問，謝謝！

Mr_Yao

見書中有這樣一段代碼，不知何意，請教高手。多謝！

echo -e "Enter name \c"
read tmp
my_name=${tmp%%,*}

請問第三行是什麼意思?謝謝！

yinyuemi

回復 1# Mr_Yao


   

       ${parameter%word}
       ${parameter%%word}
              The word is expanded to produce a pattern just as in pathname expansion.  If the pattern  matches
              a  trailing  portion  of the expanded value of parameter, then the result of the expansion is the
              expanded value of parameter with the shortest matching pattern (the ââ%ââ case)  or  the  longest
              matching  pattern  (the ââ%%ââ case) deleted.  If parameter is @ or *, the pattern removal opera-
              tion is applied to each positional parameter in turn, and the expansion is  the  resultant  list.
              If  parameter  is  an  array  variable  subscripted with @ or *, the pattern removal operation is
              applied to each member of the array in turn, and the expansion is the resultant list.

Mr_Yao

明了，Thx SS