Improve this answer. Alternatively to manually creating temporary files, sponge from moreutils is a nice tool that takes care of this, e. You are correct. I will delete that passage. It would be nice to see the original data and not just the pre-processed stuff. Kusalananda I would not - it does not make sense for OP's aim. I just wanted to make OP aware what happens in his code and where bash behaves different from his expectations.
Show 4 more comments. With roaima help I was able to narrow down the issue, In your answer, result correctly holds multiline data. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses.
Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked Related 2. Hot Network Questions. Accept all cookies Customize settings. Both is valid provided your values preceded by the equation character span up to the end of a line and are not followed by comments or other characters with semantics deviating from a simple "value".
I can't comment here yet on other's posts. To indicate the line just pass the line number, in your case 3, before s or before the initiating quote char just like in vim. Please take a look at info sed. For example, 3. In the op's case, there are at least four different ways to extract the POP server name from the file:. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. Extract a part of one line from a file with sed Ask Question. Asked 8 years, 5 months ago. Active 2 years, 4 months ago. Viewed k times. I want to read one part of one line from a file. This text is on the third line. I do this to extract the line: sed -n '3p' installation. For example, display the username and login time of all logged-in users:.
If the fields aren't separated by the default tab character, use the -d option to specify a different delimiter. That means that the character specified after the -d option is considered the separator in the lines.
In place of the [delimiter] argument, specify the delimiter you want. You can use any character as a delimiter. Using the cut command to extract fields from a file without specifying the -d option means that the default delimiter is the tab character. Note: The echo command prints out a text string you provide as an output message. When piping into commands whose output doesn't have a fixed format e. Using the -f option to separate by fields is a better choice in that case.
In the example above, we used the -f option to extract the second field from the employees. To cut specific fields from a file, specify a different delimiter. Thus, you cannot extract all the users on the system by relying on the character number. Hence, count the number of colons to extract the same fields. For example:. The output returns each user in the system and their home directory, corresponding to fields 1 and 6, respectively.
For example, the following command prints all fields except the first and third:. Specify a delimiter in the output using the --output-delimiter option. Note: If you are just starting with Linux commands, take a look at the comprehensive overview in our article Linux Commands Cheat Sheet.
You now know what the Linux cut command is and how to use it to process a file or command output. Feel free to test out the different options to get used to them and maximize your use of the command line for manipulating data and command outputs. Linux cut Command Explained with 6 Examples November 29, Introduction The cut command is a command-line utility that allows you to cut out sections of a specified file or piped data and print the result to standard output.
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