如何在文件中每一行的开头添加一个字符串? [英] How can I prepend a string to the beginning of each line in a file?

问题描述

我有以下 bash 代码，它逐行循环遍历文本文件.

I have the following bash code which loops through a text file, line by line .. im trying to prefix the work 'prefix' to each line but instead am getting this error:

rob@laptop:~/Desktop$ ./appendToFile.sh stusers.txt kp
stusers.txt
kp
./appendToFile.sh: line 11: /bin/sed: Argument list too long
[e-mail],passw0rd

这是 bash 脚本..

This is the bash script ..

#!/bin/bash

file=$1
string=$2

echo "$file"
echo "$string"

for line in `cat $file`
do
    sed -e 's/^/prefix/' $line
    echo "$line"
done < $file

我在这里做错了什么?

更新:执行文件头将所有行转储到终端的单行上，可能相关?

Update: Performing head on file dumps all the lines onto a single line of the terminal, probably related?

rob@laptop:~/Desktop$ head stusers.txt
rob@laptop:~/Desktop$ ouse.com,passw0rd

推荐答案

一行 awk 命令也应该可以解决问题:

a one-line awk command should do the trick also:

awk '{print "prefix" $0}' file

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