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bash 脚本，保存命令输出的每一行

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bash 脚本，保存命令输出的每一行

我在编写将命令输出的每一行保存#mount | grep ^\/dev/到变量中的 bash 脚本时遇到问题。

下面是我的 bash 脚本。

#!/bin/bash
mount | grep ^\/dev/ > tempoary
input=$(cat tempoary)
x=0
while IFS= read -r line
do
  x=$((x+1))
  echo "$line" > /tmp/directory/$x
  for file in $(echo "$line"); do
  eval "var$x=$file";
  echo "$file"
  done
done <<< "$input"

输出如下：

[root@localhost tmp]# sh script
/dev/mapper/rhel-root
on
/
type
xfs
(rw,relatime,seclabel,attr2,inode64,noquota)
/dev/sda1
on
/boot
type
xfs
(rw,relatime,seclabel,attr2,inode64,noquota)

我希望有这样的输出格式：

[root@localhost tmp]# sh script
/dev/mapper/rhel-root on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
/dev/sda1 on /boot type xfs (rw,relatime,seclabel,attr2,inode64,noquota)

您能给我一些指导，告诉我如何实现这一目标吗？

附言。双引号"$(echo "$line")"没有帮助，只会提示下面的语法错误。

[root@localhost tmp]# sh script
script: eval: line 14: syntax error near unexpected token `('
script: eval: line 14: `var1=/dev/mapper/rhel-root on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)'

答案1

将文件直接重定向到while ... done：

mount | grep ^\/dev/ > tempoary
while IFS= read -r line
do
...
done < temporary

或使用进程替换来省略临时文件：

while IFS= read -r line
do
...
done < <(mount | grep ^\/dev/)

或类似地通过管道传递给 while

mount | grep ^\/dev/ |
while IFS= read -r line
do
...
done

答案2

在 for 循环之前添加 IFS 并引用文件变量使一切正常......看看这个：

#!/bin/bash
mount | grep ^\/dev/ > tempoary
input=$(cat tempoary)
x=0
while IFS= read -r line
do
  x=$((x+1))
  echo "$line" > /tmp/tmp/$x
  IFS=
  for file in $(echo "$line"); do
  eval "var$x='$file'";
  echo "$file"
  done
done <<< "$input"

答案3

根据评论

输出为“/dev/mapper/rhel-root on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)”和“/dev/sda1 on /boot type xfs (rw,relatime,seclabel,attr2, inode64,noquota)”分别。将这两行保存到变量1和变量2后

标准变量不一定是最佳答案。相反，大批更有可能是你想要的。

例如：

#!/bin/bash

typeset -A mounts

let index=0

m=$(mount | grep "^/dev/")

while read line
do
  mounts[$index]="$line"
  let index=index+1
done <<< "$m"

echo There were $index lines
let a=0
while [ $a -lt $index ]
do
  echo Line $a was ${mounts[$a]}
  let a=a+1
done

在我的机器上，如果我运行这个，我会得到

There were 4 lines
Line 0 was /dev/vda3 on / type ext4 (rw,relatime,data=ordered)
Line 1 was /dev/vda1 on /boot type ext4 (rw,relatime,data=ordered)
Line 2 was /dev/vdb on /news type ext3 (rw,relatime,data=ordered)
Line 3 was /dev/vdc1 on /brick type ext3 (rw,relatime,data=ordered)

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