Showing us the work that you have done is good. But, just showing us a script that is not working without also showing us sample input and expected output makes it hard to guess at all of the things that might be wrong in your script. The script you have shown us seems to be a strange mix of shell and awk statements.
Please tell us what operating system you're using, tell us what shell you're using, show us some sample input, and show us the exact output you want to produce from that sample input.
@Don Cragun, thank you for remind me about the manner .
my job is rarely relate to scripting and I just make this script due to my colleague request on yesterday so I just try to use what I know and google what I don't. That's why my script look like a bunch of scraps .
by the way, my OS is Linux Redhat, I'm using Perl which included. My script is used for comparing 2 file which contain lines with this info:
My expect output file which contains all lines with same values, another output file contain lines with different values. Currently, I use loop for comparing 2 file but it's seem take time cause input files having few thousand lines each, so I'm finding another way.
Quote:
Originally Posted by Aia
By the way, perl has an special variable `$.' (that's $ and period) which might help you read the specific line of a file without resorting to making calls to the external head and tail.
So instead of $line1= `head -tmp1 file1| tail -1`;
maybe something like:
Code:
open my $fh, '<', $file1 or die "$file1: $!";
my $cntl = 1; # or whatever you want
my $line;
while( <$fh> ) {
if( $. == $ctl ) {
$line = $_;
last;
}
}
close $fh
# now you can use $line here
@Aia: thank you so much for your hint. it's just where I stuck .
Thank you for the suggestion, hope it can reduce the script running time.
I want to add a line at the beginning and at the end of a file..
e.g.
echo "at the beginning.." > tmp_file &&
cat file >> tmp_file &&
echo "last line" >> tmp_file &&
mv tmp_file file
is there a nice way for doing that??
Thx (2 Replies)
Hi guys,
How to add a line before a specific line (identified with the starting work ex: xxx) of a file and write it back to the same file?
Thanks (12 Replies)
Hi,
I am a relative new bee in scripting. I need to develop a script such that the code would iterate through each file in a source directory and append every line of the file with '|' and the corresponding file filename.
eg
INPUT file IF927_1.dat -
H|abc... (4 Replies)
Hi,
I have one file a.txt ,the contents of the file is
A B C
D E F
and I have another file b.txt, the contents of the file is
1 2 3
4 5 6
now when I am using this command
cat a.txt b.txt > c.txtI am getting the output as
A B C
D E F
1 2 3
4 5 6
but i need the output... (2 Replies)
Hi,
I am new to Sed /awk commands. using that i want to add new empty line after every line in a file by leaving first three lines. So, can any one help me out how to achieve this.
Example:
---------
Input Filename: file1.txt
Input Data:
--------Report--------
Date:20-10-03... (4 Replies)
I have a tab delimited text file,
id name distance
1 3325167 0.334561754018
2 3290488 0.389444269458
3 3288794 0.392312701782
4 3347602 0.392532202097
5 3295355 0.394394169485
I need to add a line after the header line. The first and third field of... (3 Replies)
Hello Everyone,
I need a help from experts of this community regarding one of the issue that I am facing with shell scripting.
My requirement is to append char's at the end of each line of a file. The char that will be appended is variable and will be passed through command line.
The... (20 Replies)
I have a shell script that looks something like the following:
mysql -uroot db1 < db1.sql
mysql -uroot db2 < db2.sql
mysql -uroot db3 < db3.sql
mysql -uroot db4 < db4.sql
....
different db names in more than 160 lines.
I want to run this script with nohup and have a status later.
So,... (6 Replies)
Discussion started by: MKH
6 Replies
LEARN ABOUT DEBIAN
plan9-getflags
GETFLAGS(8) System Manager's Manual GETFLAGS(8)NAME
getflags, usage - command-line parsing for shell scripts
SYNOPSIS
getflags $*
usage [ progname ]
DESCRIPTION
Getflags parses the options in its command-line arguments according to the environment variable $flagfmt. This variable should be a list
of comma-separated options. Each option can be a single letter, indicating that it does not take arguments, or a letter followed by the
space-separated names of its arguments. Getflags prints an rc(1) script on standard output which initializes the environment variable
$flagx for every option mentioned in $flagfmt. If the option is not present on the command-line, the script sets that option's flag vari-
able to an empty list. Otherwise, the script sets that option's flag variable with a list containing the option's arguments or, if the
option takes no arguments, with the string 1. The script also sets the variable $* to the list of arguments following the options. The
final line in the script sets the $status variable, to the empty string on success and to the string usage when there is an error parsing
the command line.
Usage prints a usage message to standard error. It creates the message using $flagfmt, as described above, $args, which should contain the
string to be printed explaining non-option arguments, and $0, the program name (see rc(1)). If run under sh(1), which does not set $0, the
program name must be given explicitly on the command line.
EXAMPLE
Parse the arguments for leak(1):
flagfmt='b,s,f binary,r res,x width'
args='name | pid list'
if(! ifs=() eval `{getflags $*} || ~ $#* 0){
usage
exit usage
}
SOURCE
/src/cmd/getflags.c
/src/cmd/usage.c
SEE ALSO arg(3)GETFLAGS(8)
05-25-2014
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