Digest Command in Unix and Linux: Extracting Specific Information from Multiple Files
Digest is a command-line utility in Unix and Linux that takes a list of files as input and produces a list of lines of text that are contained within those files.
* It is used to extract specific information from multiple files, such as printing out all the lines that contain a certain word or phrase.
* The digest command works by reading each file one line at a time and outputting the line as a single line of text.
* It can be used in combination with other commands to perform more complex text processing tasks, such as filtering out certain lines or printing out only the lines that match a specific pattern.
Example of Digest Command :
* To print out all the lines that contain the word "hello" in all the files in the current directory, you can use the following command:
```
digest * | grep hello
```
This will read each file one line at a time and output the lines that contain the word "hello". The "*" wildcard is used to specify that all files in the current directory should be processed. The "grep" command is used to filter out only the lines that match the specified pattern.
* To print out only the lines that do not contain the word "hello" in any of the files, you can use the following command:
```
digest * | grep -v hello
```
This will read each file one line at a time and output only the lines that do not contain the word "hello". The "-v" option is used to invert the match, so that only lines that do not match the pattern are output.
* To print out the number of lines in each file that contain the word "hello", you can use the following command:
```
digest * | grep -c hello
```
This will read each file one line at a time and output the number of lines that contain the word "hello". The "-c" option is used to count the number of matches.
Conclusion :
* Digest is a powerful command-line utility in Unix and Linux that can be used to extract specific information from multiple files.
* It can be used in combination with other commands to perform more complex text processing tasks, such as filtering out certain lines or printing out only the lines that match a specific pattern.
* By using digest in combination with other commands, you can automate many text processing tasks and save time and effort.
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