使用awk或sed更改路径 [英] Change path using awk or sed

问题描述

您好，我想将符号链接路径更改为txt文件中的真实路径.首先，我找到单词"SF:"并更改路径.现在，我使用此脚本，但是它很慢且无效.我认为可以通过awk或sed命令更改它.预先谢谢你.

Hello i want to change symlink path to real path in txt file. First I find word "SF:" and change path. Now i use this script but it is slow and not effective. I think it can be changed by awk or sed command. Thank you in advance.

#!/bin/bash
FILENAME="new1.info"
    echo "" > $FILENAME
while read LINE
do
if [ "" != "$(echo $LINE | grep -e "^SF:")" ]
then
    echo "SF:""$(realpath $(echo $LINE | cut -d":" -f2))" >> $FILENAME
else
    echo $LINE >> $FILENAME
fi
done < total.info

我有一个很大的txt文件，所以我想找到"SF:"并更改类似这样的行:

I have big txt file, so I want to find "SF:" and change line from something like this:

SF:/home/ects/svn/moduleTests/ctest/tests/moduletests/base/tmp/src/base64.cpp

对此:

SF:/home/ects/svn/moduleTests/ctest/src/base/base64.cpp

推荐答案

在bash中，我会写

#!/bin/bash
while IFS= read -r line; do
    if [[ "$line" == "SF:"* ]]; then
        line="SF:$(realpath "${line#SF:}")"
    fi
    echo "$line"
done < total.info > new1.info

注意事项:

• 引用变量，每次.
• 不要使用ALLCAPS变量名，它会最终咬住您
• 请注意，输出重定向已移至while循环的外部，就像输入重定向一样
• IFS =读取-r行是从文件中精确读取行的方法.

• quote your variables, every time.
• don't use ALLCAPS varnames, it will bite you eventually
• note the output redirection has been moved to the outside of the while loop, just like the input redirection
• IFS= read -r line is the way to read lines from the file exactly.

我不知道这样做是否会更快:bash可能会非常慢，尤其是在大文件读取时， 循环.您可以尝试使用另一种语言:

I don't know if this will be any faster: bash can be quite slow, particular for while read loops over big files. You could try another language:

perl -MCwd=abs_path -pe 's/^SF:\K(.*)/ abs_path($1) /e' total.info > new1.info

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