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Place for playing with commands…
ODOC: bala@bala:~ /home$ chmod 755 new.txt
The chmod command is used to change the permission of files and directories. Here new.txt got the read,write,execute permission to the user. Read and Execute permission to Group and Others.
Generally the first digit stands for ‘User’, second digit stands for ‘Group’, and third digit stands for ‘Others’. Now 7 will be classified into 4,2,1 (i.e) Read, Write, Execute.
For more details use man chmod