Thanks a lot for all your help. This forum is really good and very helpful.
Can you please tell me what is the signification of all this :
I know FNR stands for the ordinal number of the current record in the current file and that NR stands for the ordinal number of the current record from the start of input, but I don't understand the whole sentence
The condition FNR==NR will be true only for the FIRST file passed to awk for processing. Therefore, we read file2 into hash FIRST - then proceed with the processing for the other/file1 files.
Last edited by vgersh99; 11-24-2010 at 10:54 AM..
These 2 Users Gave Thanks to vgersh99 For This Post:
Hi i hope some awk gurus here can help me.. here is what i need i have 2 files:
File1
152445 516532 405088.pdf
152445 516533 405089.pdf
152491 516668 405153.jpg
152491 520977 408779.jpg
152491 0 409265.pdf
File2
516532 /tmp/MainStreet_Sum09_Front_FNL.pdf
516533... (9 Replies)
Hi. I'm new to awk and have searched for a solution to my problem, but haven't found the right answer yet. I have two files that look like this:
file1
Delete,3105551234
Delete,3105551236
Delete,5625559876
Delete,5625556789
Delete,5625553456
Delete,5625551234
Delete,5625556956... (8 Replies)
Hi,
I want to compare two files using awk and write an output based on if the records matched.
Both the files are space delimitted.
File A:
8351 00000000000636 2009044 -00001.000
8351 00000000000637 2009044 -00002.000
8351 00000000000638 2009044 -00001.000
8351 00000000000640... (7 Replies)
Hi
How can I use awk to compare specific columns in 2 files and print the difference.
I currently have this:
BEGIN {
OFS = FS = ","
}
NR == FNR {
b = $3
next
}
{
e = ""
for (x in b) {
if (match ($1, x)) {
if (RSTART == 1 && RLENGTH > length(e)) {
e=x (2 Replies)
Hi,
I have a situation to compare one file, say file1.txt with a set of files in directory.The directory contains more than 100 files.
To be more precise, the requirement is to compare the first field of file1.txt with the first field in all the files in the directory.The files in the... (10 Replies)
Please help me to compare two files and remove the items in file2 from file1
file 1:delimited using pipe(|)
file1
00012|Description - 1|||||AA12345|1|AB12345|2|2012/06/03
AB123|Description - 2|||||AA12345|3|ZA11111|4|2012/06/04
11111|Description - 3|||||AP00012|1|AB12345|2|2012/06/03... (8 Replies)
I have a below requirement and trying to compare the files using awk
File 1 - Already stored on a prev day
id | text | email id
---------------------------------
89564|this is line 1 | xyz@sample.txt
985384|this is line 2 | abc@sample.txt
657342|this is line 3 |... (3 Replies)
HI!!
I am trying to compare two files using AWK but I have some problems. I need to count how many times letters are used in two texts. This is my script
{
long=length($0)
for (i=1;i<=long;i++)
{
aux=substr($0,i,1)
if ( aux != " " && aux != "" )
... (7 Replies)
Discussion started by: ettore8888
7 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.16.3 2010-06-11 SHELL-QUOTE(1)