To read the file in '$1", you can simply cat "$1" but for the next requirement, write something with a loop that says:
Code:
#!/bin/bash
while read the_line; do
echo "$the_line"
done < "$1"
exit 0
From the example you wrote, you need to read every other line
Code:
#!/bin/bash
while read the_line; do
((i++%2)) && { echo "$the_line";}
done < "$1"
exit 0
i is a variable that's incremented (i++) on every line read. i%2 returns 1 or 0, depending i is odd or even, basically, it returns 0 when i is 2; 4; 6; ...
And in sh/bash and many others scripting languages; zero means no errors.
No Errors: execute what's after the &&, so echo "$the_line"
hi, first congratulations on the nice forum!
Can anybody write script, which can make copy of some or all files of the current directory in new directory (called "backups", which must be made in the current directory, if it's not already exist). And bring out a massage (report) with the count... (7 Replies)
Hi,
root@server] df -h
121G 14G 101G 12% /home
147G 126G 14G 91% /backup
We having our site files and images are storing in
/backup/home/user/files/ through symbolic link created in /home directory pointing in /backup directory as following.
root@server] cd /home... (1 Reply)
I am very new to Linux/Unix. Kindly assist the following:
I wish to write a bash shell script called how_many_to_go that calculates and prints the number of days, hours, minutes and/or seconds until the end of the current month (based on the output of the date command).
Do ... (2 Replies)
Hi All
I am a new in scripting language and I would like help for you guys
I would like to create a file named constant.h and search into all files *.m in specific directory for a reg-exp @"LBL_]+" exp: @"LBL_75847" , and write those matchs to constant.h if there are not written (no... (15 Replies)
i'm trying to write a bash script that that will automatically extract zip files after the download.
i writed this script
#!/bin/bash
wget -c https://github.com/RonGokhle/kernel-downloader/zipball/master
CURRENDIR=/home/kernel-downloader
cd $CURRENDIR
rm $CURRENDIR/zipfiles 2>/dev/null
... (2 Replies)
Hi All,
I am unable to write the script for the below requirement.
Requirement:
Main table dir_ancillary table contain three column "dir_ancillary.table_name"," dir_ancillary.text_file_name ", "dir_ancillary.Include" .
This dir_ancillary contain undefined tables in the column... (2 Replies)
Hi Team
I am trying to put together a nice small script to mount my lvm snapshot
Here are my objectives
1 Check whether snapshot is currently mounted. If so echo umount snapshot and exit from the script.
2 If it's not mounting, check whether the mount point exist, If so, create lvm... (0 Replies)
Hello experts, I need help writing individual files from a data matrix, with each new file being written every time there is a blank line:
From this
cat file.txt
col1 col2 col3
6661 7771 8881
6661 7771 8881
6661 7771 8881
col1 col2 col3
3451 2221 1221... (6 Replies)
Hello guys, I need some help. I am new in bash and I don't know how to automate the following script.
head -2 out1 > 1.fasta
sed ‘1,2 d' out1 > out2
rm out1
head -2 out2 > 2.fasta
sed ‘1,2 d' out2 > out1
rm out2
head -2 out2 > 3.fasta
sed '1,2 d' out2 > out1
rm out2
.......... (3 Replies)
How would I write a value to a physical memory address?
I was able to read a physical memory address (for example, 0x400) using this line:
dd if=/dev/mem count=4 bs=1 skip=$(( 0x400 ))
But I get an error:
dd: 'standard input': cannot skip to specified offset
when I try to write using... (1 Reply)
Discussion started by: rabrandt
1 Replies
LEARN ABOUT FREEBSD
atf-sh
ATF-SH(1) BSD General Commands Manual ATF-SH(1)NAME
atf-sh [-s shell] -- interpreter for shell-based test programs
SYNOPSIS
atf-sh script
DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.
atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter-
preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not
use any non-standard extensions.
The following options are available:
-s shell Specifies the shell to use instead of the value provided by ATF_SHELL.
ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes.
ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes.
ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a
specific interpreter.
EXAMPLES
Scripts using atf-sh(3) should start with:
#! /usr/bin/env atf-sh
Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode
the path to atf-sh in the script and then use the -s option afterwards as a single parameter:
#! /path/to/bin/atf-sh -s/bin/bash
ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts.
SEE ALSO atf-sh(3)BSD September 27, 2014 BSD
06-06-2011
