In awk, I'd like to check if a field is blank.
And by blank I mean, the field could be "" or " "
In other words, the field could either be empty, or be filled with spaces.
Would the regex look like this?
$5 ~ // { Action }?
What other ways are there?
Hmm.. in any case I think... (7 Replies)
i want a command for my script!!!
say file consists of character 123 125 127.
i need a query to replace the number 2 with 0
so the output should be 103 105 107.
i use unix-aix (8 Replies)
i am a newbie to shell script,so i want a kshell script in which i need to check for a particular character inside a file through conditional looping(like if ,case,while)and if that character exists ,then substitute a given character to that character.
consider a file test.txt,inside the file... (1 Reply)
HI ,
I have to check the values of variable is blank or not.
exm :
###test
test1
var=`cate filename | head -1 | cut -c1-3`
I need to check the first three character of 1st line . if it is blank .then exit or we need to process .
Thanks in advance . (2 Replies)
Hi,
i am trying to get the no of users using
nofActUsers=$(echo /usr/sbin/lsof -l | grep "/mast/data/users" )
it will return blank, if the user does nto have permissions to run the script.
Now I need to check if the valueis blank i have route to another script else the user has to... (1 Reply)
hi,
I have a doubt in replacing characters with blank.
My requirement is that, i have one file and looks like below
4:ALTER SYSTEM DISCONNECT SESSION '193,191' IMMEDIATE;
6:ALTER SYSTEM DISCONNECT SESSION '205,7274' IMMEDIATE;
5:ALTER SYSTEM DISCONNECT SESSION '206,34158' IMMEDIATE;... (4 Replies)
Hello,
I have an AIX 5.3 system. I want to check users to see whether there are users with blank passwords but i would prefer to do that without checking /etc/passwd or /etc/security/passwd files.
Also while i was searching the web for a solution i noticed that many people refer to /etc/shadow... (2 Replies)
Hi all,
I have 89 columns,1200 rows in a flat file, some of the values are just '.' (the character dot). I want to replace them by nothing (blank), but when I do so, it affects the decimal numbers too. so 12.34 becomes 1234.
How can I just replace values which are only '.' with 1 white... (13 Replies)
Hi Folks,
I have a huge data of the below format
abc #apple 1200 06/23
ghj #orange 1500 06/27
uyt #banana 2300 05/13
efg #vegetable 0700 04/16
After first 3 letters, i have 9 spaces and after fruit there are no specific fixed space, but it varies... (4 Replies)
Hi All
Need Help
I have a file with the below format (ABC.TXT) :
®¿¿ABCDHEJJSJJ|XCBJSKK01|M|7348974982790
HDFLJDKJSKJ|KJALKSD02|M|7378439274898
KJHSAJKHHJJ|LJDSAJKK03|F|9898982039999
(cont......)
I need to write a script where it will check for : blank lines (between rows,before... (6 Replies)
Discussion started by: chatwithsaurav
6 Replies
LEARN ABOUT V7
diff
DIFF(1) General Commands Manual DIFF(1)NAME
diff - differential file comparator
SYNOPSIS
diff [ -efbh ] file1 file2
DESCRIPTION
Diff tells what lines must be changed in two files to bring them into agreement. If file1 (file2) is `-', the standard input is used. If
file1 (file2) is a directory, then a file in that directory whose file-name is the same as the file-name of file2 (file1) is used. The
normal output contains lines of these forms:
n1 a n3,n4
n1,n2 d n3
n1,n2 c n3,n4
These lines resemble ed commands to convert file1 into file2. The numbers after the letters pertain to file2. In fact, by exchanging `a'
for `d' and reading backward one may ascertain equally how to convert file2 into file1. As in ed, identical pairs where n1 = n2 or n3 = n4
are abbreviated as a single number.
Following each of these lines come all the lines that are affected in the first file flagged by `<', then all the lines that are affected
in the second file flagged by `>'.
The -b option causes trailing blanks (spaces and tabs) to be ignored and other strings of blanks to compare equal.
The -e option produces a script of a, c and d commands for the editor ed, which will recreate file2 from file1. The -f option produces a
similar script, not useful with ed, in the opposite order. In connection with -e, the following shell program may help maintain multiple
versions of a file. Only an ancestral file ($1) and a chain of version-to-version ed scripts ($2,$3,...) made by diff need be on hand. A
`latest version' appears on the standard output.
(shift; cat $*; echo '1,$p') | ed - $1
Except in rare circumstances, diff finds a smallest sufficient set of file differences.
Option -h does a fast, half-hearted job. It works only when changed stretches are short and well separated, but does work on files of
unlimited length. Options -e and -f are unavailable with -h.
FILES
/tmp/d?????
/usr/lib/diffh for -h
SEE ALSO cmp(1), comm(1), ed(1)DIAGNOSTICS
Exit status is 0 for no differences, 1 for some, 2 for trouble.
BUGS
Editing scripts produced under the -e or -f option are naive about creating lines consisting of a single `.'.
DIFF(1)