Question: How do I remove junk characters from a Unix file?

Question: How do I remove junk characters from a Unix file?

How do I remove a junk character in Unix?

Different ways to remove special characters from UNIX files.

  1. Using vi editor:-
  2. Using command prompt/Shell script:-
  3. a) Using col command: …
  4. b) Using sed command: …
  5. c) Using dos2unix command: …
  6. d) To remove the ^M characters in all files of a directory:

How do you delete data in a Unix file?

5 Ways to Empty or Delete a Large File Content in Linux

  1. Empty File Content by Redirecting to Null. …
  2. Empty File Using ‘true’ Command Redirection. …
  3. Empty File Using cat/cp/dd utilities with /dev/null. …
  4. Empty File Using echo Command. …
  5. Empty File Using truncate Command.

How do I remove the first character from a Unix file?

You can also use the 0,addr2 address range to limit replacements to the first substitution, eg That will remove the 1st character of the file and the sed expression will be at the end of its range — effectively replacing only the 1st occurrence. To edit the file in place, use the -i option, eg

What are the junk characters?

hey, any character having an ascii equivalent decimal value of more than 127 is a junk character(courtesy www.asciitable.com). My database is SQL SERVER 2008.

How do I convert a special character to a csv file?

Open the excel csv. csv file using your preferred text editor, for example Notepad. Click File > Save As, enter a file name and change the encoding to UTF-8. Then click the Save button.

How do I remove a UTF-8 character from a CSV file?

2 answers

  1. use a charset that will accept any byte such as iso-8859-15 also known as latin9.
  2. if output should be utf-8 but contains errors, use errors=ignore -> silently removes non utf-8 characters, or errors=replace -> replaces non utf-8 characters with a replacement marker (usually ? )

How do you delete multiple lines in Unix?

Deleting Multiple Lines

  1. Press the Esc key to go to normal mode.
  2. Place the cursor on the first line you want to delete.
  3. Type 5dd and hit Enter to delete the next five lines.

How do you force delete a file in Linux?

To remove file or directory forcefully, you can use the option -f force a deletion operation without rm prompting you for confirmation. For example if a file is unwritable, rm will prompt you whether to remove that file or not, to avoid this and simply execute the operation.

How do you clear a log file?

How to clean log files in Linux

  1. Check the disk space from the command line. Use the du command to see which files and directories consume the most space inside of the /var/log directory. …
  2. Select the files or directories that you want to clear: …
  3. Empty the files.

How do I remove the first character of a line in Unix?

2 answers

  1. find . – type f -name “*.java” – to find all *.java files recursively.
  2. sed -i ‘s/. {10}//’ – remove the 1st 10 characters from each line in each found file ( -i option allows to modify the file in-place)
  3. this solution will work with GNU sed . With BSD sed you need -i ” , as -i requires an argument there.

How do I remove the first character of a string in Shell?

To remove the first character of a string in any POSIX compatible shell you need only look to parameter expansion like: ${string#?}

Conclusion

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