Display contents of a file

Lesson 9/75
Course: Scientific Computing Essentials
  • Screencast Terminal
00:00-00:00

Displaying the contents of a file

clear (clear screen)

Before you start the next section, you may like to clear the terminal window of the previous commands so the output of the following commands can be clearly understood.

At the prompt, type clear. This will clear all text and leave you with the prompt at the top of the window.

cat (concatenate)

The command cat can be used to display the contents of a file on the screen. Type: cat file if the file is longer than than the size of the window, so it scrolls past making it unreadable.

cat /etc/passwd
bash

Input

head

The head command writes the first ten lines of a file to the screen.

head /usr/local/data/auto.csv
bash

Input

By default the head command will only print the first few (10) lines, if you want more pass the command with option e.g, head -n 20 file.

tail

The tail command writes the last ten lines of a file to the screen. It will take similar options as the head.

tail -n 50 /usr/local/data/auto.csv
bash

Input

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Class Lessons

Introduction Introduction to scientific comput    Virtual cluster    Cluster Computing Cluster computers Cluster computer components How to access? Data transfer Linux Foundation for Scientific C Introduction File and folder commands Display contents of a file    Wildcards    Redirection and pipes File system security access Processes and Jobs Useful UNIX commands    Compiling UNIX software packages Scientific Software Scientific software stack Software modules Scheduling jobs Portable Batch System Introduction to PBS PBS basic commads PBS job submission    PBS Statistics PBS jobs management PBS job states PBS variables PBS job arrays SLURM - Workload Manager Introduction to Slurm Slurm commands Slurm job submission    Slurm array job    C/C++ Foundation Variables, Literals and Constants Data Types Input and Output Operators Comments    Conditions Switch Loops Goto Functions Recursion Arrays Strings Structures Pointers C++ STL STL Vectors Lists Map Queue Set Stacks Pair C++ OpenMP OpenMP OpenMP- Hello world!    Open MP - reduction OpenMP - section C++ MPI (Message Passing Interfac MPI - Message Passing Interface MPI program structure MPI - Hello world! MPI send and receive C++ CUDA GPUs - graphics processing units CUDA programming overview CUDA Threads, Blocks and Grid CUDA memory model CUDA Kernel CUDA Hello world! CUDA square an array of numbers CUDA vector addition CUDA matrix multiplication C++ Boost Library Boost Boost Multiprecision C++ Scientific Computing MKL - Matrix Multiplication LAPACK - Linear Algebra Conclusion Conclusion and further readings

Quiz

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