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Get number from line bash

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. It only takes a minute to sign up. Trying to figure out how to convert an argument to an integer to perform arithmetic on, and then print it out, say for addOne. In bash, one does not "convert an argument to an integer to perform arithmetic".

SEE VIDEO BY TOPIC: Shell Scripting Tutorial-49: Count the number of words & sentences in a text file without using 'wc'

Shell scripting (bash)

Thanks for the question. Another way to do it is with head and tail. Your way might be easier. I want just to edit first line of file by appending something to the first line and rest is same. How should I achieve it?? Hi, how can I find a certain string in an output and then print the following lines?

Try this A quick solution using awk: awk ' NR! Hope that helps. Hi Peter, I'd like to extract values for several variables located in the file. How can I got all values? Thank you. The -g means globally replace not just the first occurence on a line by default.

I can't verify the correctness because I am away on vacation and does not have access to a Linux computer.. Thank you, Peter! This works! Val, Try this it takes your original approach, and simplifies it somewhat. I've got one for you : I've got an html file that needs parsing. I need to find a text string xx:xx:xx in an html file and extract the 3 lines under it and on those lines, I would like to strip off the html table tags td. Any ideas? Thanks Ryan. No problem, with some time and google I got it working with a combination of things.

Ryan, grep -A is clever. Hi, thanks for all the tips. I have a file with indented lines similar to this: line 1 indent 1 indent 2 line 2 line 3 indent 1 indent 2 line 8 indent 1 line 55 I want to print lines 2 and 55 because they do not have indented comments under them. Also it would be nice to assign 2 and 55 to a variable array. I've googled quite a lot, but no luck yet. Would be interesting in seeing how you guys would solve this. Peter, nice post. I tried this on 6GB file. Hi guys, I'm not sure if I'll get a reply from this but I wanted to give it a shot, my situation is similar to all the rest exposed before and at the same time particularly different so here it is and I hope someone could give me a hand since I simply can't figure this one out.

I hope I was very clear and hopefully someone can give me a hand. Thanks for that post, exactly what I was looking for. And thanks in the name of all the other commenters for all your personalized problem solving for them, Peter! This has become some sort of one-man advice forum Lastly, you give too little information, Eri, to take your question seriously.

I was wondering if you could help me on this one. I would like to search for two strings per line then print the next X integers after each string.

The integers may vary in length and there is always a space between the string and integers. It should search like this for each line. Example: line1-sometext Lat: Nice article as for me. It would be great to read something more about that topic. Thnx for giving this info. Linda Kiev escort tours. Hello, I wish to extract all lines from a text file, which contains a particular word.

Hi Peter, Thanks for the original article and for still answering questions 5. You've come very close to answering my question but not quite. Can I somehow use an index file combined with the above? Thanks in advance and I understand if I don't hear from you, you've already gone above and beyond.

Hi, I want to extract lines from a file such that it extracts all the lines from line 1 to the line it encounters a string like "dump" in a new file. How can I do that? So what if I had a huge file and I wanted to extract, say, every 4th line? Dana Cepat. I have a file of 9 lines say as below.

Hello all, I'm trying to run a sed command to recursively print out line 14 from all files in a directory, can someone advise how I can achieve this? For example, if I have the file foo. Eight years ago, Alan posted the question: "How to delete line 5 if it contains some string? Since the blog is about sed, a more consistent answer is to solve it using sed thus: sed -n '5! Here, i created a label 'L0'. The solution means: If not line 5 then goto label L0 and just print the line.

Else, check for presence of 'some string' and delete entire line 5 if that string is found. Hi, I have a question. Assume a file with 30 lines. I want to extract 12th character of 4th line.

Totally late coming, but if all you want to do is print the first so many lines you can just do sed 11q somefile. Nice post. Hi, I have file containing the following lines Thanks in advance. Post a Comment. Search This Blog. Saturday, March 22, Using sed to extract lines in a text file. If you write bash scripts a lot, you are bound to run into a situation where you want to extract some lines from a file. Yesterday, I needed to extract the first line of a file, say named somefile.

So, let's try extracting lines using sed: the s tream ed itor. The default output behavior is to print every line of the input file stream. The explicit 1p command just tells it to print the first line To fix it, you need to suppress the default output using -n , making explicit prints the only way to print to default output. Note that the single quotes are necessary. Otherwise, the! What if the lines you want to extract are not in sequence, say lines 1 to 2, and line 4?

Related articles from this blog: Use sed or perl to extract every nth line in a text file. Use awk to extract lines. Extract columns and fields from text files. Useful sed tricks to customize configuration files. Posted by Peter Leung. Email This BlogThis! April 16, at PM Peter Leung said Interesting use of head n tail together.

April 22, at PM Anonymous said May 19, at AM Peter Leung said June 2, at AM Peter Leung said June 7, at AM Peter Leung said June 7, at AM Anonymous said Is there a way to delete line 5 if it contains some string?

June 13, at AM Peter Leung said June 13, at PM Unknown said Hi Peter, How to extract a random line assigned by a script variable, in sed? September 4, at AM Peter Leung said

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If you often create Bash scripts, you may sometimes need to get the length of a string or find out the length of a variable that stores some string. This short note shows how to find out the length of a string from the Linux command line and how to count the length of the each line in a file. You will also see how to get the length of a string if it is stored in a variable in Bash and then assign that calculated number of characters to another variable. Cool Tip: Needs to pass arguments to a Bash script? Make it to print usage and exit if they are not provided!

Thanks for the question. Another way to do it is with head and tail.

A shell script is a text file with a list of shell commands and it is executed like a program to perform a task or a set of tasks. The primary aim of a shell script is to automate tasks and save time. It is important to understand basic structure of a shell script, since it is you interact with a computing clusters via shell scripts See next chapter on Sun Grid Engine. There are many different shells available in Unix systems.

Keyboard Input and Arithmetic

Today's Posts. Quick Links. Search Forums. Show Threads. Show Posts. Shell Programming and Scripting. Printing the line number in bash script. Registered User.

Bash: String Length – How To Find Out

This is a short post on how to recognize numbers such as simple integers, real numbers and special codes such as zip codes and credit card numbers and also extract these number from unstructured text in the popular bash Bourne Again Shell shell or scripting language. Bash is the default Unix console or terminal window on Macintosh computers as well as a number of other Apple products. It is also used by cygwin and several other variants of Unix and Linux. Regular expressions are a compact efficient way of representing patterns of characters including the letters in the English alphabet and digits. There is extensive information on the web on regular expression.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. It only takes a minute to sign up. The user typed in. How can I do this?

Previous Contents Next. Up to now, our scripts have not been interactive. That is, they did not require any input from the user. In this lesson, we will see how your scripts can ask questions, and get and use responses. To get input from the keyboard, you use the read command. The read command takes input from the keyboard and assigns it to a variable.

Number lines in a file

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up. I'm assuming that you are using OS X, which doesn't have the -t option in mv. This will be painfully slow if the script is processing thousands of files. Remove the echo before mkdir and mv if the output is satifactory. Sign up to join this community. The best answers are voted up and rise to the top.

Sep 9, - A collection of handy Bash One-Liners and terminal tricks for data processing and Linux system Grep and count number of empty lines.

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Your attempt with sed is almost right, just need a add a single whitespace character for excluding from replacement,.

Regular Expressions for Numbers in BASH

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Shell Programming and Scripting

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Comments: 1
  1. Didal

    Who knows it.

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