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sed 스크립트로 변수 대체

tag-icon • tag-icon bash sed
sed 스크립트로 변수 대체

이 코드를 실행한 후

#!/bin/bash
rm -f myfile myfile-individual
echo "Greetings, foobar!" > myfile
MYSTRING="Jack"
cat myfile | sed 's:foobar:$MYSTRING:' > myfile-individual

우리는 결국

Greetings, $MYSTRING!

myfile-individual에서.

대신 출력을 위한 (sed/bash) 스크립트는 무엇이어야 합니까?

Greetings, Jack!

답변1

작은따옴표를 큰따옴표로 변경합니다. 그리고 고양이를 버리세요(UUoC):

sed "s:foobar:$MYSTRING:" myfile > myfile-individual

Bash 맨페이지에서:

   Enclosing characters in single quotes preserves the  literal  value  of
   each character within the quotes.  A single quote may not occur between
   single quotes, even when preceded by a backslash.

   Enclosing characters in double quotes preserves the  literal  value  of
   all  characters  within the quotes, with the exception of $, `, \, and,
   when history expansion is enabled, !.  The characters $  and  `  retain
   their  special meaning within double quotes.  The backslash retains its
   special meaning only when followed by one of the following  characters:
   $,  `,  ", \, or <newline>.  A double quote may be quoted within double
   quotes by preceding it with a backslash.  If enabled, history expansion
   will  be  performed  unless an !  appearing in double quotes is escaped
   using a backslash.  The backslash preceding the !  is not removed.

답변2

sed -i 's|foobar|$MYSTRING' myfile-individual

이렇게 하면 대체가 수행되고 파일에 기록됩니다.

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