mike-neck/bash-substitution.md

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bash わからん

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bash-substitution.md

bash の文字列置換

1.置換

/ 演算子を使う。
"${variable/pattern/substitution}" の形で指定する
pattern の部分にマッチした一番最初の場所だけが書き換えられる
/ の後に / が続く場合は、 pattern にマッチする部分が全て書き換えられる。

例

echo "${PWD}" # -> /tmp/docs/2023-03-16
echo "${PWD/2/two}" # -> /tmp/docs/two023-03-16
echo "${PWD//-//}" # -> /tmp/docs/2023/03/16

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