Question

我有一份名为<代码>sqlfile的案文,内容如下:

a.sql
b.sql
c.sql
d.sql

What I want is that to store them in variables and then print using for loop. But here I get only d.sql in the output of the script.

文字:

#!/bin/bash

while read line
do
files=`echo $line`
done < /home/abdul_old/Desktop/My_Shell_Script/sqlfile

for file in $files
        do
                echo $file
        done

Answer 1

A variable can only hold one element, what you want is an array

#!/bin/bash

while read line
do
  files+=( "$line" )
done < /home/abdul_old/Desktop/My_Shell_Script/sqlfile

for file in "${files[@]}"
do
  echo "$file"
done

Answer 2

while read line
do files="$files $line"
done < /home/abdul_old/Desktop/My_Shell_Script/sqlfile

或

files=$(</home/abdul_old/Desktop/My_Shell_Script/sqlfile)

或

files=$(cat /home/abdul_old/Desktop/My_Shell_Script/sqlfile)

You re doing way too much w或k in your loop.

The middle alternative w或ks with bash; the other two w或k with most shells. Prefer $(...) to back-quotes.

This code assumes there are no spaces in file names to mess things up. If you do use blanks in file names, you have to w或k marginally harder - see the array-based solution by SiegeX

Answer 3

I think you need to make the "files" as array. otherwise, as soon as the while finishes, "files" stores the latest "line". try:

files=( "${files[@]}" $line )

Answer 4

这一权利,你将最后价值视为“档案”。

你必须使用+=而不是 =

#!/bin/bash

while read line
do
files+=`echo " $line"`
done < /home/abdul_old/Desktop/My_Shell_Script/sqlfile

for file in $files
        do
                echo $file
        done

Answer 5

使用读物是罚款,但你必须首先将国际住房基金会的环境变数从每一行中取出:。保留主要的白色空间,同时进行阅读和研读; 编造按照Bash/a的行文。

Answer 6

你们都必须:

readarray myData < sqlfile

This will put file lines into an array called myData
Now you can access any of these lines like this:

printf "%s
" "${myData[0]}" #outputs first line
printf "%s
" "${myData[2]}" #outputs third line

并且,你可以放弃:

for curLine in "${myData[@]}"; do
    echo "$curLine"
done

Note that these lines would contain character as well. To remove trailing newlines you can use -t flag like this:

readarray -t myData < sqlfile

readarray is a synonym to mapfile. You can read about it in man bash

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