How to tell whether a file is a symbolic link in shell script All In One

How to tell whether a file is a soft symbolic link in shell script All In One

shell 脚本中如何判断一个文件是否是软链接 / 软符号链接

error

软链接自动指向原文件 bug ❌

# 软链接
$ test ./test.sh -ef ./test-soft-link.sh
$ echo $?
0

# 硬链接 ❌
$ test ./test.sh -ef ./test-hard-link.sh
$ echo $?
0

# test commnad
$ man test

#!/usr/bin/env bash

# 软链接 bug ❌ 自动指向原文件
echo "./test.sh -ef ./test-soft-link.sh"
# if [ ./test.sh -ef ./test-soft-link.sh ]; then
if [[ ./test.sh -ef ./test-soft-link.sh ]]; then
  echo "yes ✅"
else
  echo "no ❌"
fi

echo "./test.sh -ef ./test-hard-link.sh"
# if [ ./test.sh -ef ./test-hard-link.sh ]; then
if [[ ./test.sh -ef ./test-hard-link.sh ]]; then
  echo "yes ✅"
else
  echo "no ❌"
fi

# 单方括号 [] ✅
echo "[ ./test.sh -ef ./test-demo.sh ]"
if [ ./test.sh -ef ./test-demo.sh ]; then
  echo "yes ✅"
else
  echo "no ❌"
fi

# 双方括号 [[]] ✅
echo "[[ ./test.sh -ef ./test-demo.sh ]]"
if [[ ./test.sh -ef ./test-demo.sh ]]; then
  echo "yes ✅"
else
  echo "no ❌"
fi

solutions

# stat commnad
$ man stat

# stat
if [ "$(stat -c %h -- "$file")" -gt 1 ]; then
    echo "File has more than one name."
fi

# check if shell script is a symlink
if [[ -L "$HOME/test-soft-link.sh" ]]; then
  echo "It's a soft link ✅"
else
  echo "It's not a soft link ❌"
fi

if [[ -L /home/eric/test-soft-link.sh ]]; then
  echo "It's a soft link ✅"
else
  echo "It's not a soft link ❌"
fi

if [[ -L "$HOME/test-hard-link.sh" ]]; then
  echo "It's a soft link ✅"
else
  echo "It's not a soft link ❌"
fi

if [[ -L /home/eric/test-hard-link.sh ]]; then
  echo "It's a soft link ✅"
else
  echo "It's not a soft link ❌"
fi

eric@rpi4b:~ $ echo $HOME
/home/eric
eric@rpi4b:~ $ pwd
/home/eric
# /home/eric/test-hard-link.sh

# soft symbol link ✅
eric@rpi4b:~ $ [ -L ./test-soft-link.sh ] && [ -e ./test-soft-link.sh ]
eric@rpi4b:~ $ echo $?
0

# hard symbol link ❌
eric@rpi4b:~ $ [ -L ./test-hard-link.sh ] && [ -e ./test-hard-link.sh ]
eric@rpi4b:~ $ echo $?
1

demos

eric@rpi4b:~ $ ls -ali | grep test
 24553 -rw-r--r--  1 eric eric   411  9月 21 11:37 nvm_echo_test.sh
 30221 -rwxr-xr-x  1 eric eric   172  9月 21 18:03 shell-env-variable-test.sh
 30331 -rwxr-xr-x  1 eric eric    47 10月 25 00:26 test-demo.sh
 24592 -rwxr-xr-x  2 eric eric   156  9月 21 13:15 test-hard-link.sh
 24592 -rwxr-xr-x  2 eric eric   156  9月 21 13:15 test.sh
 23662 lrwxrwxrwx  1 eric eric     7 10月  8 16:44 test-soft-link.sh -> test.sh
eric@rpi4b:~ $ test ./test.sh -ef ./test-soft-link.sh
eric@rpi4b:~ $ echo $?
0
eric@rpi4b:~ $ 

refs

https://www.cnblogs.com/xgqfrms/p/17786079.html

https://www.cnblogs.com/xgqfrms/p/17728141.html#5221859

https://stackoverflow.com/questions/5767062/how-to-check-if-a-symlink-exists
https://unix.stackexchange.com/questions/167610/determining-if-a-file-is-a-hard-link-or-symbolic-link

https://koenwoortman.com/bash-script-check-if-file-is-symlink/

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