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Sunday, November 1, 2009

Posted by venu k
4 comments | 11:56 AM

# SCRIPT: bigfile.sh
# PURPOSE: This script is used to create a text file that
# has a specified number of lines that is specified
# on the command line.


echo "............USAGE ERROR............"
echo "USAGE: $0 <number_of_lines_to_create>"

# Argument Checking

if [ $# -ne 1 ] # Looking for exactly one parameter
usage # Usage error was made
exit 1 # Exit on a usage error

# Define files and variables here

LINE_LENGTH=80 # Number of characters per line
OUT_FILE=bigfile.$$ # New file to create
>$OUT_FILE # Initialize to a zero-sized file
TOTAL_LINES=$1 # Total number of lines to create
LINE_COUNT=0 # Character counter
CHAR=X # Character to write to the file

# Beginning of Main

CHAR_COUNT=0 # Initialize the CHAR_COUNT to zero on every new line

while ((CHAR_COUNT < LINE_LENGTH)) # Each line is fixed length
echo -e "$CHAR\c" >> $OUT_FILE # Echo a single character
let CHAR_COUNT++ # Increment the character counter

echo>>$OUT_FILE # Give a newline character


  1. your blog is rocking man. I practiced many scripts form your blog. It's really helpful.
    Thank for sharing your knowledge.

    K Pallavi

  2. There's no need to repeat the inner loop for every line:

    while [ $(( CHAR_COUNT += 1 )) -le $LINE_LENGTH ]

    while [ $(( LINE_COUNT += 1 )) -le $TOTAL_LINES ]
    echo "$LINE"
    done > "$OUT_FILE"

  3. i have a problem with updating one of the fields in my file....i want the field to be updated everyday by adding one when the employee is absent

    thank you in advance

  4. This article great helped him and tell us how to create a shell script file and how to save data thanks for share it biosketch format .