Bash如果块明显不应该运行

Question

代码:

first=true
mountpoint=" "
partlist=`df -h | grep "^/dev"` # get partition info
for i in $partlist              # loop through info
do
  if [[ ${i:0:1} = "/" ]]       # items starting with / are what I'm interested in
  then
    if [[ $first ]]             # The first instance in each pair is the device name
    then
      mountdev=$i
      mountpoint=" "
      first=false
    else                        # The second instance is the device mount point
      mountpoint=$i
      first=true
    fi
    if [[ $mountpoint != " " ]] # If the mountpoint was just set (last to be set
                                #   before printing config)
    then
      # Print config
      echo "${mountpoint} \${fs_size ${mountpoint}"
      echo "USED \${fs_used ${mountpoint}}\${alignr}\${fs_free ${mountpoint}} FREE"
      echo "\${fs_bar 3,300 ${mountpoint}}"
      echo "READ \${diskio_read  ${mountdev}}\${alignr}\${diskio_write  ${mountdev}} WRITE"
      echo ""
    fi
  fi
done

问题:

目标是创建一个脚本,为我的每台计算机生成我首选的conky配置,而无需为每台计算机编辑文件.以上是一个片段,生成报告我的磁盘使用信息的部分.不幸的是,我输入ANYTHING时遇到了麻烦.我把各种调试回声扔进去,除了实际输出配置的if语句之外,它似乎都正常工作.我不知道它有什么问题.有什么建议或帮助吗？

谢谢你:)

Answer 1

这是错误的路线:

if [[ $first ]]             # The first instance in each pair is the device name

这总是评估为真.[[ true ]]或是[[ false ]]同义词[[ -n true ]]或[[ -n false ]]总是正确的.

你可能意味着什么

if "$first"

要么

if [[ $first == true ]]