Question

我正在尝试编写sed命令来自动更改我的脚本。此脚本用于根据提供的应用程序版本将SQL修补程序应用于数据库。为了更好地理解，我简化了这个脚本，源代码就像

# something before
if [ "$BRANCH" = "TRUNK" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
    apply_patch.sh trunk
elif [ "$BRANCH" = "2.0" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
elif [ "$BRANCH" = "1.0" ]
then
    apply_patch.sh 1.0
fi
# something after

基于两个输入参数（当前版本和下一版本），我需要将此脚本更改为以下

# something before
if [ "$BRANCH" = "TRUNK" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
    apply_patch.sh 2.1
    apply_patch.sh trunk
elif [ "$BRANCH" = "2.1" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
    apply_patch.sh 2.1
elif [ "$BRANCH" = "2.0" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
elif [ "$BRANCH" = "1.0" ]
then
    apply_patch.sh 1.0
fi
# something after

Answer 1

关于如何修改逻辑的

草图我将不得不检查正确的数组语法
但基本上停止重复和重写
只需在修补更改时向阵列添加新元素

ln -s trunk 99999
declare -a appver=( 1.0 2.0 2.1 99999)

for patch in  ${appver[@]} ; do
  if [ ${BRANCH} <= ${patch} ] then 
      apply_patch.sh  ${patch}
  fi
done

Answer 2

如果版本和补丁号码可以表示为小数，那么您可能需要辅助函数来比较它们。有很多方法可以做到这一点。以下是扩展@ tomc＆＃39; sketch＆＃34;：

的示例

#!/bin/bash

function leq {
  awk -v x="$1" -v y="$2" '
    BEGIN { if (x <= y) {exit(0)} else {exit(123)} }'
}

ln -s trunk 99999
appver=( 1.0 2.0 2.1 99999 )

BRANCH="$1"
for patch in  ${appver[@]}
do
  if leq ${BRANCH} ${patch} ; then 
    apply_patch.sh ${patch}
  fi
done

Answer 3

您的要求非常模糊且不清楚，但可能是您想要的：

$ cat tst.awk
/if.*TRUNK/ { inTrunk = 1 }
inTrunk     {
    if (/elif/) {
        sub(/trunk/,new,buf)
        print buf prev

        sub(/TRUNK/,new,buf)
        print buf $0

        inTrunk = 0
    }
    else {
        buf = buf $0 ORS
        prev = $0
    }
    next
}
{ print }

$ awk -v new=2.1 -f tst.awk file
# something before
if [ "$BRANCH" = "TRUNK" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
    apply_patch.sh 2.1
    apply_patch.sh trunk
if [ "$BRANCH" = "2.1" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
    apply_patch.sh 2.1
elif [ "$BRANCH" = "2.0" ]
then
    apply_patch.sh 1.0
    apply_patch.sh 2.0
elif [ "$BRANCH" = "1.0" ]
then
    apply_patch.sh 1.0
fi
# something after

用sed或awk更改脚本文件的一部分

3 个答案: