无法将整行回显到文件

Question

我不知道如何将以下行回显到文件中。它只有一部分进入文件。

echo perl -e "printf(\"%.1lf%%\n\", ($reserved_block_count * 100.0 ) / $block_count);">>Show_Percent_Reserved_Blocks.sh

当我运行下面的脚本时，我得到

andyk_~/Downloads$ Show_Percent_Reserved_Blocks.sh
/home/andy/bin/Show_Percent_Reserved_Blocks.sh: line 2: Block: command not found
/home/andy/bin/Show_Percent_Reserved_Blocks.sh: line 3: Reserved: command not found
syntax error at -e line 1, near "/ )"
Execution of -e aborted due to compilation errors.

#!/bin/bash
Block count:              421958912
Reserved block count:     4219589
perl -e "printf(\"%.1lf%%\n\", ($reserved_block_count * 100.0 ) / $block_count);"

Answer 1

问题是，当您使用双引号时，变量引用 ( $reserved_block_count, $block_count) 在当前（调用）shell 环境中被扩展；你需要用单引号引用整个事情：

echo 'perl -e "printf(\"%.1lf%%\n\", ($reserved_block_count * 100.0 ) / $block_count);"' >>Show_Percent_Reserved_Blocks.sh