bash脚本，用于从列表中间进行迭代

Question

我有一个bash脚本，它在一个sql脚本文件夹上迭代。当脚本遇到错误时，我希望它能智能地运行。我不想跑两步。

for a in $files_list; do
command 1
command 2 
.
.
done

如果1、2、3、4、5是要执行的文件，则脚本在步骤3退出并出现一些错误。在下一次执行中，我只想从步骤3开始运行。我有一个变量，用于检测脚本在哪个步骤退出。我一直坚持从那个变量开始迭代。这是可以做的事情吗？任何建议都可以接受。我也愿意改变我的逻辑。

Answer 1

确实没有花太多时间，但假设您想要执行的所有命令都存储在test.txt文件中

test.txt

ls
cal
du
d
date
ls

下面的bash脚本采用两个参数filename(存储命令的位置(和checkpoint(需要启动的位置(。

测试.sh

## Function to read a file line by line
checkpoint=$2
filename=$1
checkpointReached=false
read_file_line_by_line() {
local file="$1"
while IFS= read -r line
do
if [ $checkpointReached == "false" ] && [ "$line" != "$checkpoint" ] ; then
echo "...... Finding checkpoint....... current line is $line"
fi
if [ "$line" == "$checkpoint" ]; then
echo "        *************************************************
Checkpoint reached. Commands after checkpoint
*****************************************************"        
checkpointReached=true
continue
fi
if $checkpointReached; then
echo "        $line"
execute_command $line
fi
done < "$file"
}
function execute_command() {
local command="$1"
echo "   Executing ..........     $command"
if eval $command; then
echo "   Command executed successfully"
else
echo "   Command failed. Exiting........"
echo "   Please note the new checkpoint.... $command"
exit 1
fi
}
read_file_line_by_line "$filename"

让我们第一次运行它，检查点是第一个命令，即ls，它预计在d失败，这是无效命令

╰─ bash test.sh text.txt "ls"
*************************************************
Checkpoint reached. Commands after checkpoint
*****************************************************
Executing ..........     ls
test.sh         test.yaml       text.txt
Command executed successfully
du
Executing ..........     du
24      .
Command executed successfully
d
Executing ..........     d
test.sh: line 33: d: command not found
Command failed. Exiting........
Please note the new checkpoint.... d

现在我们知道了检查站。所以我们把它传下去。假设d现在是固定的，为了脚本起见，我们将其更改为echo。在您的情况下，脚本d将被修复。

╰─ bash test.sh text.txt "echo"
...... Finding checkpoint....... current line is ls
...... Finding checkpoint....... current line is du
*************************************************
Checkpoint reached. Commands after checkpoint
*****************************************************
Executing ..........     echo
Command executed successfully
date
Executing ..........     date
Mon Sep 12 14:50:44 +04 2022
Command executed successfully

如果这有帮助，请告诉我。