Basic Linux Command - IT Job QnS

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Previous Job Question: Basic Linux Command

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Linux Command

- ☆
  1
  Linux Command
  (a)Write Shell command which make a folder name 'A' with read permission access only.
  Janata, ASA, 21 | AME/ANE/AE
```
mkdir A
chmod 400 A
```
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  2
  Linux Command
  (b)Write Shell command which copy folder 'A' all information into folder 'P'. Folder 'A' and folder 'P's parent folder is same.
  Janata, ASA, 21 | AME/ANE/AE
```
cp -r A P
```
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  3
  Linux Command
  Linux Command in ownership and group permission.
  Pubali, HE, 23 | Bank
  Linux Ownership and Group Permissions
  1. chown (Change Ownership)
  The chown command is used to change the owner and group of files or directories.
  Syntax:
```
chown [owner]:[group] [file/directory]
```
  Examples:
  - Change the owner of a file:
    
    chown username file.txt
  - Change both owner and group of a file:
    
    chown username:groupname file.txt
  - Recursively change ownership for all files and subdirectories:
    
    chown -R username:groupname /path/to/directory
  2. chgrp (Change Group Ownership)
  The chgrp command changes only the group ownership of a file or directory.
  Syntax:
```
chgrp [group] [file/directory]
```
  Examples:
  - Change the group of a file:
    
    chgrp groupname file.txt
  - Recursively change the group for all files in a directory:
    
    chgrp -R groupname /path/to/directory
- ☆
  4
  Linux Command
  Explain the meaning of chmod 750 backup.sh and chown root:admin backup.sh. Write a command to grant the owner read/write/execute permissions, the group read/execute permissions, and no permissions to others.
  CB, ANE, 2026 | Assistant Network Engineer
- ☆
  5
  Linux Command
  Write a Linux command to count the total number of characters and words from the first 10 lines of a file named wasacustomers.txt.
  Dwasa,AME,25 | Other
  Command:
```
head -10 wasacustomers.txt | wc -mw
```
  Explanation:
  - head -10 wasacustomers.txt → Extracts the first 10 lines of the file.
  - wc -m → Counts the total number of characters.
  - wc -w → Counts the total number of words.
  - | → Pipes the output of the head command to wc.
  Therefore:
  head -10 wasacustomers.txt | wc -mw
  This command counts the characters and words from the first 10 lines of wasacustomers.txt.
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  6
  Linux Command
  Unix command (directory listing with hidden files).
  SB & JB, ADA, 22 | ADA
  Answer:
```
$ ls -al
```
- ☆
  7
  Linux CommandOthers
  State the exact administrative active performed by running the command chmod 755 script.sh on a linux target file.
  RAKUB, ANSE, 26 | AME/ANE/AE
  Permission Breakdown:
  755 means:
  - Owner: 7 = read (r) + write (w) + execute (x)
  - Group: 5 = read (r) + execute (x)
  - Others: 5 = read (r) + execute (x)
  Administrative Action:
  - Grants full control (rwx) to the file owner
  - Grants read and execute permission to group users
  - Grants read and execute permission to all other users

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