linux - bash PWD缩短

我正在寻找一个bash函数，该函数将缩短长路径名，以防止PS1变量过长。类似于以下内容:

/this/is/the/path/to/a/really/long/directory/i/would/like/shortened

可能最终会变成:

/t../i../t../p../to/a/r../l../d../i/w../like/shortened

对于我的.bashrc文件，采用所需的路径以及可以缩短的最大可接受字符数将是完美的选择。

最佳答案

Python脚本怎么样？这将首先缩短最长的目录名称，一次缩短一个字符，直到达到其长度目标或无法获得更短的路径。它不会缩短路径中的最后一个目录。

(我开始用普通的shell脚本编写此代码，但是人，bash讨厌字符串操作。)

#!/usr/bin/env python
import sys

try:
    path   = sys.argv[1]
    length = int(sys.argv[2])
except:
    print >>sys.stderr, "Usage: $0 <path> <length>"
    sys.exit(1)

while len(path) > length:
    dirs = path.split("/");

    # Find the longest directory in the path.
    max_index  = -1
    max_length = 3

    for i in range(len(dirs) - 1):
        if len(dirs[i]) > max_length:
            max_index  = i
            max_length = len(dirs[i])

    # Shorten it by one character.
    if max_index >= 0:
        dirs[max_index] = dirs[max_index][:max_length-3] + ".."
        path = "/".join(dirs)

    # Didn't find anything to shorten. This is as good as it gets.
    else:
        break

print path

输出示例:

$ echo $DIR
/this/is/the/path/to/a/really/long/directory/i/would/like/shortened
$ ./shorten.py $DIR 70
/this/is/the/path/to/a/really/long/directory/i/would/like/shortened
$ ./shorten.py $DIR 65
/this/is/the/path/to/a/really/long/direc../i/would/like/shortened
$ ./shorten.py $DIR 60
/this/is/the/path/to/a/re../long/di../i/would/like/shortened
$ ./shorten.py $DIR 55
/t../is/the/p../to/a/r../l../di../i/wo../like/shortened
$ ./shorten.py $DIR 50
/t../is/the/p../to/a/r../l../d../i/w../l../shortened

关于linux - bash PWD缩短，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/1616678/