What is hash Linux command?
The Linux hash command allows users to perform fast password hashing using various algorithms such as MD5, SHA-256, and SHA-512.
hash Syntax:
Section titled “hash Syntax:”hash [option] [name]hash Options:
Section titled “hash Options:”| Option | Description |
|---|---|
| -r | Forget all remembered locations |
| -t | Display the full pathname of the command, if found |
| -p | Display the full pathname of the command specified by name, if found |
Parameters:
Section titled “Parameters:”| Parameter | Description |
|---|---|
| name | The name of the command to locate in the hash table |
hash Command Usage Examples:
Section titled “hash Command Usage Examples:”Generate the hash value for a file
Section titled “Generate the hash value for a file”hash filename.txtCalculates the hash value for the specified file “filename.txt”.
Verify file integrity using hash
Section titled “Verify file integrity using hash”hash -c data.txt.hashChecks the integrity of the file “data.txt” by comparing its hash value stored in “data.txt.hash”.
Generate SHA256 hash value of a string
Section titled “Generate SHA256 hash value of a string”echo "Hello World" | hash -a sha256Calculates the SHA256 hash value for the string “Hello World”.
Recursively calculate hashes for files in a directory
Section titled “Recursively calculate hashes for files in a directory”hash -r ./directoryRecursively computes hash values for all files in the specified directory.
Display available hash algorithms
Section titled “Display available hash algorithms”hash -lLists all available hash algorithms that can be used with the hash command.
How do I use hash in Linux?
Section titled “How do I use hash in Linux?”To use the hash command in bash, execute the following command:
hashHow to clear the hash table in Linux?
Section titled “How to clear the hash table in Linux?”To clear the hash table in bash, use the following command:
hash -rHow to display the full path of a command using hash?
Section titled “How to display the full path of a command using hash?”To display the full path of a command using hash in bash, use the following command:
hash <command>How do I force the rehashing of the full path to a command?
Section titled “How do I force the rehashing of the full path to a command?”To force the rehashing of the full path to a command in Linux bash, use the following command:
hash -p /new/path/to/command <command>How to show the number of hits for each command in the hash table?
Section titled “How to show the number of hits for each command in the hash table?”To show the number of hits for each command in the hash table in bash, use the following command:
hash -lHow to enable hashing for a specified command name?
Section titled “How to enable hashing for a specified command name?”To enable hashing for a specified command name in Linux bash, use the following command:
hash -p /path/to/command <command>How can I disable hashing for a specified command?
Section titled “How can I disable hashing for a specified command?”To disable hashing for a specified command in Linux bash, use the following command:
hash -d <command>How to check the hash table size in Linux?
Section titled “How to check the hash table size in Linux?”To check the hash table size in bash, use the following command:
hash -tApplications of the hash command
Section titled “Applications of the hash command”- Used to display or update the current hash table for locating the full pathname of a command.
- Helps in managing the efficiency and performance of the shell by reducing the time taken to locate and execute commands.