TA貢獻(xiàn)1856條經(jīng)驗(yàn) 獲得超11個(gè)贊
變量以雙引號(hào)字符串?dāng)U展，但不在單引號(hào)字符串中擴(kuò)展：
$ name=World $ echo "Hello $name" Hello World $ echo 'Hello $name' Hello $name
如果您只需切換引號(hào)，請執(zhí)行此操作。
如果您更喜歡使用單引號(hào)來避免額外的轉(zhuǎn)義，則可以在同一參數(shù)中混合和匹配引號(hào)：
$ echo 'single quoted. '"Double quoted. "'Single quoted again.' single quoted. Double quoted. Single quoted again. $ echo '"$name" has the value '"$name" "$name" has the value World
適用于您的案例：
echo 'test text "here_is_some_test_text_'"$counter"'" "output"' >> "$FILE"
TA貢獻(xiàn)1860條經(jīng)驗(yàn) 獲得超9個(gè)贊
使用printf：
printf 'test text "here_is_some_test_text_%s" "output"\n' "$counter" >> ${FILE}
TA貢獻(xiàn)1852條經(jīng)驗(yàn) 獲得超7個(gè)贊
使用heredoc：
cat << EOF >> ${FILE}test text "here_is_some_test_text_$counter" "output"EOF舉報(bào)