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AWK - Built-in Variables
Top Forums Shell Programming and Scripting awk print redirection to variable file name. Registered User. Join Date: Feb Hello, i need to redirect the output of print to a variable file name: Code :.
Join Date: Nov Thanks krao!!! Code :. Hi krao, really appreciate your conecern. Join Date: Dec This works as long as the variable containing the filename is a positional variable. But if you are using some logic to change the file names not once per line but on some other key, I could find no way to output to a filename in a named variable. EOF and then execute that.
So I'm writing a script which tries to parse human-readable addresses. I'm trying to prnt 1 wherever that's greater The bash bash below extracts the oldest folder from a directory and stores it in filename That result will match a line in bold in input. That is the lint to print in output I almost reach my objective Youhouuu!!!!
But I really don't understand why it doesn't work until the end The operations I am doing in the script gsub and print really don't have any importance!!! I just matter about I have list of files: ls a.
I want to rename my file like this: 7 Replies. I have a system stat command running which generates data after 5 sec or so. I pass this data to awk and do some calculation to present the data differently. Once done now I want to pass this data to file as and when generated but doesn't work.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Sadly, this does not work. Second question, which method is better? What is the difference between strong quote and weak quote here? Don't play with shell expansion and quoting it's a real headache.
Pass in any shell variables nicely with -v. Learn more. Why using variable in awk printf doesn't work? Ask Question. Asked 7 years ago. Active 7 years ago. Viewed 4k times. Newbie here. I am trying to use awk print a few information. So I wrote a shell scripts! Daniel Daniel 1, 6 6 gold badges 27 27 silver badges 45 45 bronze badges.
It is a file. The file U is in a folder called 0. Daniel - wrt your question of What is the difference between strong quote and weak quote. What do you consider a "strong" vs 'weak" quote? We normally just talk about single and double quotes.
In the case of your script just don't do any of the alternatives referred to in your question - they are both very bad. Active Oldest Votes. You need to comma separator the arguments to printf. Always quote your shell variables! However it may not be the best approach but I couldn't say as no context was provied. Chris Seymour Chris Seymour No, it's not working. The output is messed up since there are many key word outlet in the file. TheodrosZelleke good spot missed that one, answer needs reworking anyway due to the new information given by OP.
Edited since the question was changed, This returns valid data, but it is not clear what the expected output of ps -ef is and what is expected in variable. The '-' int the awk record matching pattern removes the need to remove awk itself from the search results. Jeremy If you post the output of ps -ef grep "port 10"and what you need from the line, it would be more easy to help you getting correct syntax. Learn more. Saving awk output to variable [duplicate] Ask Question.
Asked 6 years, 7 months ago. Active 3 years, 1 month ago. Viewed k times. Can anyone help me out with this problem? I'm trying to save the awk output into a variable. Noam M 2, 5 5 gold badges 22 22 silver badges 37 37 bronze badges. Jeremy Jeremy 1 1 gold badge 6 6 silver badges 11 11 bronze badges.print with awk linux
The problem is not really clear. What is the error you get? Problem: variable does not show up in the printf statement. I want to save that parameter into a variable so I can work with it. Active Oldest Votes. It was probably accidentally removed when the answer was edited. Jotne Jotne 36k 9 9 gold badges 38 38 silver badges 48 48 bronze badges. The Overflow Blog. Featured on Meta.2007 ford expedition fuse diagram
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You use the print statement for simple output. You use the printf statement for fancier formatting. Both are described in this chapter.Bio 311c ut austin reddit
The print statement does output with simple, standardized formatting. You specify only the strings or numbers to be printed, in a list separated by commas. They are output, separated by single spaces, followed by a newline.
The statement looks like this:. The entire list of items may optionally be enclosed in parentheses. Numeric values are converted to strings, and then printed. The print statement is completely general for computing what values to print. However, with two exceptions, you cannot specify how to print them--how many columns, whether to use exponential notation or not, and so on. For the exceptions, see section Output Separatorsand section Controlling Numeric Output with print. For that, you need the printf statement see section Using printf Statements for Fancier Printing.
To print a fixed piece of text, use a string constant such as "Don't Panic" as one item. If you forget to use the double-quote characters, your text will be taken as an awk expression, and you will probably get an error. Keep in mind that a space is printed between any two items.
Each print statement makes at least one line of output. But it isn't limited to one line. If an item value is a string that contains a newline, the newline is output along with the rest of the string. A single print can make any number of lines this way. Here is an example that prints the first two fields of each input record, with a space between them:.
A common mistake in using the print statement is to omit the comma between two items. This often has the effect of making the items run together in the output, with no space. The reason for this is that juxtaposing two string expressions in awk means to concatenate them. Here is the same program, without the comma:. A heading line at the beginning would make it clearer.
The headings and the table data don't line up! We can fix this by printing some spaces between the two fields:. You can imagine that this way of lining up columns can get pretty complicated when you have many columns to fix. Counting spaces for two or three columns can be simple, but more than this and you can get lost quite easily. This is why the printf statement was created see section Using printf Statements for Fancier Printing ; one of its specialties is lining up columns of data.
As a side point, you can continue either a print or printf statement simply by putting a newline after any comma see section awk Statements Versus Lines. As mentioned previously, a print statement contains a list of items, separated by commas. In the output, the items are normally separated by single spaces. This need not be the case; a single space is only the default. You can specify any string of characters to use as the output field separator by setting the built-in variable OFS.
The initial value of this variable is the string " "that is, a single space.Today's Posts. Quick Links. Search Forums. Show Threads. Show Posts. Shell Programming and Scripting. Variable inside AWK printf.Skyrim cbbe dresses
Registered User. Join Date: Jul Hi, Is it possible to print a variable inside awk printf?? Join Date: Apr What is the problem? The statement seems valid. Am sorry when i give more than one variable am getting an error Code :.
HTML Code:. Code :. When specifying multiple variables, you need to put -v in front of each of them: Code :. Thank you all I have one more question When i sum up the values of a column, i get the total in exponent, is it possible to convert in to a round fingure with 2 decimal places?
Variable and awk inside for loop. Thanks all for taking time out and reading this thread and big Thanks to all who have come forward for rescue. Background: I have a variable "nbrofcols" that has number of columns from a data file.
Now, using this count in for loop, I am trying to get the maximum length of each column present Variable assignment inside awk. Passing awk variable argument to a script which is being called inside awk.So far we have used AWK's print and printf functions to display data on standard output.
But printf is much more powerful than what we have seen before. This function is borrowed from the C language and is very helpful while producing formatted output.
In the above syntax fmt is a string of format specifications and constants.
Similar to any string, format can contain embedded escape sequences. The following example prints a backspace after every field except the last one. It erases the last number from the first three fields. For instance, Field 1 is displayed as Fieldbecause the last character is erased with backspace.
In the following example, after printing every field, we do a Carriage Return and print the next value on top of the current printed value.
It means, in the final output, you can see only Field 4as it was the last thing to be printed on top of all the previous fields. As in C-language, AWK also has format specifiers. It prints a single character. Otherwise, the argument is assumed to be a string, and the only first character of that string is printed. It prints an unsigned hexadecimal number. The field is padded to the width. By default, the field is padded with spaces but when 0 flag is used, it is padded with zeroes.
A leading zero acts as a flag, which indicates that the output should be padded with zeroes instead of spaces. Please note that this flag only has an effect when the field is wider than the value to be printed. The expression should be left-justified within its field. When the input-string is less than the number of characters specified, and you want it to be left justified, i. Previous Page.
Next Page. Previous Page Print Page.The simplest output statement is the by-now familiar "print" statement. There's not too much to it:. The "printf " formatted print function is much more flexible, and trickier. It has the syntax:.
This prints "Hi, there! So far, "printf " looks like a step backward from "print", and for do dumb things like this, it is. However, "printf " is useful when precise control over the appearance of the output is required. The trick is that the string can contain format or "conversion" codes to control the results of the expressions in the expression list.
For example, the following program:. The "printf " function substitutes the three variables in the expression list for these format codes on output.
Learn How to Use Awk Variables, Numeric Expressions and Assignment Operators – Part 8
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