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sed スクリプトへの変数の置換

tag-icon • tag-icon bash sed
sed スクリプトへの変数の置換

このコードを実行した後

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

結局

Greetings, $MYSTRING!

myfile-individual 内。

代わりに出力するための（sed/bash）スクリプトは何か

Greetings, Jack!

答え1

一重引用符を二重引用符に変更します。そして、cat (UUoC) を削除します。

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

bash のマニュアルページから:

   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.

答え2

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

これにより置換が行われ、ファイルに書き込まれます

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