Awk multiple program files

Loop through multiple files in bash script. Hi Everybody, I'm a newbie to shell scripting, and I'd appreciate some help. I have a bunch of. I want to remove lines and Plink processing multiple commands using Bash. I'm completely brand new to bash scripting migrating from Windows batch file scripting. I'm currently trying to write a bash script that will automatically reset "error-disabled" Cisco switch ports. Please forgive the very crude and inefficient script I have so far shown below.

It is Hello, I extracted a list of files in a directory with the command ls. However this is not my computer, so the ls functionality has been revamped so that it gives the filesizes in front like this : This is the output of ls command : I stored the output in a file filelist 1.

Processing multiple files awk. Passing multiple files to awk. Hi all, I have a load of files in the format e. How do I do this? Bash script to copy timestamps of multiple files. Hi, I have a bunch of media files in a directory that have been converted from MTS to MOV format , so my directory contains something like this: clip1.

If your find implementation doesn't have -newermt , you'll have to make do with -newer , which compares the date of the file that find found with a fixed file.

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Viewed 42k times. Im trying to search for the files Created in June,July and August months. Improve this question. Depending on your needs, it may not produce what we would like for blank or whitespace-only lines. In that case, that second version could be a little bit better:. So, depending on your taste, you may prefer writing that instead:.

Worth mentioning here you may also use END blocks to perform some tasks after the last record has been read. Like we will see it just now. That being said, I admit this is far from being perfect since whitespace-only lines are not handled elegantly. AWK support the standard arithmetical operators.

And will convert values between text and numbers automatically depending on the context. Also, you can use your own variables to store intermediate values. All that allows you to write compact programs to perform calculations on data columns:. Please note AWK variables do not need to be declared before usage.

An undefined variable is assumed to hold the empty string. Which, according to the AWK type conversion rules, is equal the 0 number. In all those cases, it will count as 0 and will not interfere with our summation.

Of course, it would be different if I performed multiplications instead. I have already mentioned the END rule before. Here is another possible application to count the number of non-empty lines in a file:.

That is each line containing at least one character. Finally, the END block is used to display the final result once the entire file has been processed. I could have used Count , count , n , xxxx or any other name complying with the AWK variable naming rules.

However, is this result correct? But maybe would you prefer considering whitespace-only lines as empty too? This time the result is different since that later version ignores whitespace-only lines too, whereas the initial version only ignored blank lines. Can you see the difference? I let you figure that by yourself. Finally, if you are interested only in data lines, and given my particular input data file, I could write that instead:. It works because of the AWK type conversion rules.

In my file, data records contain a number in their first field. Non-data records heading, blank lines, whitespace-only lines contain text or nothing. All of them being equal to 0 when converted to numbers.

Notice with that latest solution, a record for a user eventually having 0 credits would be discarded too. Arrays are a powerful feature of AWK. All arrays in AWK are associative arrays , so they allow associating an arbitrary string with another value. If you are familiar with other programming languages, you may know them as hashes , associative tables , dictionaries or maps.

I can store an entry for each user in an associative array, and each time I encounter a record for that user, I increment the corresponding value stored in the array. I admit this is no longer a one-liner. Mostly because of the for loop used to display the content of the array after the file has been processed. Arrays, just like other AWK variables, can be used both in action blocks as well as in patterns. By taking benefit of that, we can write a one-liner to print only duplicate lines:.

So that first record is not written on the output. Then that entry is changed from zero to one. The line will be printed. However, before that, the array entry is updated from 1 to 2. And so on. The only difference is the use of the logical, not operator!

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