You asked: How do I remove special characters from a UNIX shell script?

How do I remove special characters in Unix?

Remove CTRL-M characters from a file in UNIX

  1. The easiest way is probably to use the stream editor sed to remove the ^M characters. Type this command: % sed -e “s/^M//” filename > newfilename. …
  2. You can also do it in vi: % vi filename. Inside vi [in ESC mode] type: :%s/^M//g. …
  3. You can also do it inside Emacs.

How do I remove special characters in Linux?

Remove files with names containing strange characters such as spaces, semicolons, and backslashes in Unix

  1. Try the regular rm command and enclose your troublesome filename in quotes. …
  2. You can also try renaming the problem file, using quotes around your original filename, by entering: mv “filename;#” new_filename.

How do I remove a character from a string in shell script?

Remove Character from String Using tr

The tr command (short for translate) is used to translate, squeeze, and delete characters from a string. You can also use tr to remove characters from a string. For demonstration purposes, we will use a sample string and then pipe it to the tr command.

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How do I remove special characters from a string in bash?

The first tr deletes special characters. d means delete, c means complement (invert the character set). So, -dc means delete all characters except those specified. The n and r are included to preserve linux or windows style newlines, which I assume you want.

How do I remove special characters from a text file?

Or if you really want to remove the special characters in your file (as you state in the title of your question), you can use iconv -f … -t ascii//TRANSLIT . In this last case, the “special characters” will be approximated by normal ASCII characters.

Which command tells the currently working shell?

2) Using ps command: ps command stands for “Process Status”. It is used to check the currently running status and their PIDs. If the ps command is run generally in the shell then it simply tells the name of the shell. The first column tells the PID and the last column tells the type of shell i.e. bash.

What is sed command in UNIX?

SED command in UNIX is stands for stream editor and it can perform lot’s of function on file like, searching, find and replace, insertion or deletion. Though most common use of SED command in UNIX is for substitution or for find and replace. … SED is a powerful text stream editor.

How delete all files by name in Linux?

Type the rm command, a space, and then the name of the file you want to delete. If the file is not in the current working directory, provide a path to the file’s location. You can pass more than one filename to rm . Doing so deletes all of the specified files.

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How can I remove last character from a string in UNIX?


  1. SED command to remove last character. …
  2. Bash script. …
  3. Using Awk command We can use the built-in functions length and substr of awk command to delete the last character in a text. …
  4. Using rev and cut command We can use the combination of reverse and cut command to remove the last character.

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

Bash/ksh shell substitution example

The syntax to remove last character from line or word is as follows: x=”foo bar” echo “${x%?}”

How do I change the last character of a string in a shell script?

Since we have bash, we can also use the super-simple “index to the last char and replace it, e.g. To index to the last char you use ${str:0:$((${#str}-1))} (which is just str:0:to_last-1 ) so to replace the last character, you just add the new last character at the end, e.g.

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