feat(u/bktemp-checkAppFileDir):Fix zero-length string bug
[BK-2020-03.git] / unitproc / bkmvln
1 #!/bin/bash
2 # Desc: Moves sybolic link
3 # Usage: bkmvln
4 # Input: arg1: path of existing symbolic link
5 # arg2: path where link should be moved
6 # Output: None
7 # Depends: gnucoreutils 8.30
8 # Ref/Attrib:
9 # 1. Christopher Neylan. https://stackoverflow.com/questions/8523159/how-do-i-move-a-relative-symbolic-link#8523293
10 # 2. Tomáš Pospíšek. https://stackoverflow.com/a/30508868
11
12 help() {
13 echo 'usage: mv_ln src_ln dest_dir'
14 echo ' mv_ln --help'
15 echo
16 echo ' Move the symbolic link src_ln into dest_dir while'
17 echo ' keeping it relative'
18 exit 1
19 }
20
21 # Show help if `--help` flag given, if arg1 isn't a symbolic link, or
22 # if arg2 isn't a directory.
23 [ "$1" == "--help" ] || [ ! -L "$1" ] || [ ! -d "$2" ] && help
24
25 set -e # exit on error
26
27 orig_link="$1"
28 orig_name=$( basename "$orig_link" )
29 orig_dest=$( readlink -f "$orig_link" )
30 dest_dir="$2"
31
32 ln -r -s "$orig_dest" "$dest_dir/$orig_name"
33 rm "$orig_link"