Running sh script gives command not found for any unix/linux basic commands

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I’m running Shell script which has basic commands.

For any command in script I’m getting errors as below:

line 3548: mv: command not found
line 3550: cmd: command not found
line 708: mkdir: command not found
line 715: cygpath: command not found
line 726: mv: command not found
line 727: cp: command not found
line 731: mv: command not found
line 732: cp: command not found
line 736: mv: command not found
line 737: cp: command not found
line 749: expr: command not found
line 770: expr: command not found

NOTE: I’ve added c:cygwinbin and various other directories under c:Cygwinusr like sbin,X11R6,local in my windows system variable PATH. I also tried reinstalling Cygwin with same issue. I’m using Windows 10. I’m running cmd in admin mode and then running bash.