如何使用 echo 和 fsck 组合输出值

Question

首先，绝不解析 - 的输出ls永远无法可靠地工作，有太多的事情可能（将会！）导致它失败。使用find ... -print0和mapfile来填充数组。

例如


# Get all symlinks in /dev/disk/by-label/ except those
# containing Inukaze or LUBUNTU in the name.  Use NUL
# as the filename separator so it will work with ANY
# filename, even those containing annoying characters like
# spaces or shell metacharacters.
mapfile -d '' -t Etiqueta < <(
    find /dev/disk/by-label/ -type l \
    ! -name '*Inukaze*' \
    ! -name '*LUBUNTU*' \
    -print0)

# now loop over those symlinks
for f in "${Etiqueta[@]}" ; do
  # label name without path
  label="${f/*\//}"

  # get the real path of the symlink
  rp="$(realpath "$f")"

  # skip those that aren't block devices
  [ -b "$rp" ] || continue

  # skip block devs with size 72GB. Strip leading and
  # trailing spaces from lsblk's output with sed.
  size=$(lsblk -n -o size "$rp" | sed -E -e 's/^ *| *$//g') 
  [ "$size" = "72G" ] && continue 

  # Now do whatever you need to with "$rp".
  # Remember to always double-quote your variable expansions.

  # Use printf rather than echo because echo is unreliable and
  # easily broken.
  printf "\nExaminando: %s (%s)\n" "$label" "$rp"

  if fsck -fy "$rp" ; then
     if ! fsck -fy "$rp" ; then
       printf "%s\n" "Error second fsck of $label ($rp) failed." >&2
     fi
  else
    printf "%s\n" "Error: first fsck of $label ($rp) failed." >&2
  fi
done

也可以看看：

为什么不是解析ls（以及该怎么做）？
为什么 printf 比 echo 更好？
在 bash 中运行help mapfile以获取有关内置映射文件的更多详细信息。https://wiki.bash-hackers.org/commands/builtin/mapfile也值得一读。

Answer 1

首先，绝不解析 - 的输出ls永远无法可靠地工作，有太多的事情可能（将会！）导致它失败。使用find ... -print0和mapfile来填充数组。

例如


# Get all symlinks in /dev/disk/by-label/ except those
# containing Inukaze or LUBUNTU in the name.  Use NUL
# as the filename separator so it will work with ANY
# filename, even those containing annoying characters like
# spaces or shell metacharacters.
mapfile -d '' -t Etiqueta < <(
    find /dev/disk/by-label/ -type l \
    ! -name '*Inukaze*' \
    ! -name '*LUBUNTU*' \
    -print0)

# now loop over those symlinks
for f in "${Etiqueta[@]}" ; do
  # label name without path
  label="${f/*\//}"

  # get the real path of the symlink
  rp="$(realpath "$f")"

  # skip those that aren't block devices
  [ -b "$rp" ] || continue

  # skip block devs with size 72GB. Strip leading and
  # trailing spaces from lsblk's output with sed.
  size=$(lsblk -n -o size "$rp" | sed -E -e 's/^ *| *$//g') 
  [ "$size" = "72G" ] && continue 

  # Now do whatever you need to with "$rp".
  # Remember to always double-quote your variable expansions.

  # Use printf rather than echo because echo is unreliable and
  # easily broken.
  printf "\nExaminando: %s (%s)\n" "$label" "$rp"

  if fsck -fy "$rp" ; then
     if ! fsck -fy "$rp" ; then
       printf "%s\n" "Error second fsck of $label ($rp) failed." >&2
     fi
  else
    printf "%s\n" "Error: first fsck of $label ($rp) failed." >&2
  fi
done

也可以看看：

为什么不是解析ls（以及该怎么做）？
为什么 printf 比 echo 更好？
在 bash 中运行help mapfile以获取有关内置映射文件的更多详细信息。https://wiki.bash-hackers.org/commands/builtin/mapfile也值得一读。

如何使用 echo 和 fsck 组合输出值

答案1

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