I want to read one row at time from above and create like below configuration for each service-desription
These are two different things, yes?
To read a line into a variable VAR do:
Code:
while read VAR ; do
echo the read line is: $VAR # this is an example how to use the variable
done < /path/to/your/input.file
If your line has several words you can use the shells field-splitting abilities to read the line into several variables. The first "field" goes to the first variable, the second to the second variable, etc. If there are less input words than variables the last variables will be empty. If there are more input words the last variable will get all the words which are not assigned up to there.
I suggest you try the following to sunderstand the mechanism: create a file with the following content:
while read VAR1 VAR2 VAR3 ; do
echo VAR1=\"$VAR1\" VAR2=\"$VAR2\" VAR3=\"$VAR3\"
done < /path/to/input.file
As a final addition you can use/modify the shell-internal IFS-variable to influence the way the shell defines what a "word" is. Per default the IFS value is a space, which is why in the above example "word1" was going into one variable and "word2" into the next. Suppose you have this file:
Code:
first value here=second value here=third value here
you could read that in, split not at spaces but at equal signs like this:
Code:
while IFS="=" read VAR1 VAR2 VAR3 ; do
echo VAR1=\"$VAR1\" VAR2=\"$VAR2\" VAR3=\"$VAR3\"
done < /path/to/input.file
{ read X; while read SD US HN WM CM CC X
do cat <<EOF
define service{
service_description $SD
use $US
host name $HN
check_command check_ssh_disk!${WM}!${CM}!$CC
}
EOF
done; } < file
define service{
service_description disk-usage-tmp
use generic-service
host name test1
check_command check_ssh_disk!80!90!/tmp
}
define service{
service_description disk-usage-var
use generic-service
host name test1
check_command check_ssh_disk!80!90!/var
}
define service{
service_description disk-usage-data
use generic-service
host name test1
check_command check_ssh_disk!80!90!/data
}
@wbport: On my linux system, line closes stdin after reading one single line of text, so your proposal in post#2 will enter an infinite loop...
Hi,
I've a csv file seperated by '|' from which I'm trying to remove the excess '|' characters more than the existing fields. My CSV looks like as below.
HRLOAD|Service|AddChange|EN
PERSONID|STATUS|LASTNAME|FIRSTNAME|ITDCLIENTUSERID|ADDRESSLINE1
10000001|ACTIVE|Testazar1|Testore1|20041|||... (24 Replies)
Hello Everyone,
My issue is that I want to traverse a database table row by row and do some action on the value retrieved in each row.
I have gone through a lot of shell script questions/posts. I could find row by row traversal of a file but not a database table.
Please help.
Thanks &... (5 Replies)
Dear experts,
I have an epoch time input file such as : -
1302451209564
1302483698948
1302485231072
1302490805383
1302519244700
1302492787481
1302505299145
1302506557022
1302532112140
1302501033105
1302511536485
1302512669550
I need the epoch time above to be converted into real... (4 Replies)
Please advice script for changing from A to B
I'd like to Split a row to multiple rows with 4 columns using shell script.
The data of the file is in one row as below that is 28Mbyte size.
A>
cto10001 0000000 201010 10:52:13 cto10001 0000000 201011 10:52:13 cto10001 0000000 201011 10:52:13... (2 Replies)
Hello,
I want to make a script to do this :
the file is with line :
TOTO TEST1
TOTO TEST2
TITI TEST1
TITI TEST2
TITI TEST3
i want he become :
TOTO TEST1 TEST2
TITI TEST1 TEST2 TEST3 (3 Replies)
Hi,
I need help on doing the below thing in shell script.
I have a file with millions of rows called "abc.txt". i have another file with millions of rows called "xyz.txt".
I would like to do the below operation.
Open the abc.txt, read the first line, do some operations on the column... (2 Replies)
Need shell script to read two file at same time and print output in single file
Example I have two files 1) file1.txt 2) file2.txt
File1.txt contains
Aaa
Bbb
Ccc
Ddd
Eee
Fff
File2.txt contains
Zzz
Yyy
Xxx (10 Replies)
Hello,
I have a Apache webserver running on RedHat. Its primary function is a proxy server for users accessing the internet. I have a transaction log that logs every transactions of every users. For users trying to access certain sites/content the transactions goes into a 302 redirect loop and... (2 Replies)
Hi,
I wrote below small script which will add up each row value from a file and print the total, but it is not.plz let me know what is wrong.script hangs and not displaying anything.
-----------------
while read line ; do
sum=0;
sum=$sum+$line;
done
echo $sum;
exit 0;
------------------... (8 Replies)
i have done a coding in shell scripting which reads a file line by line and does something....it takes more than 30 seconds to execute for a single file. when i do the same with perl scripting it takes less than a second.
is that shell scripting is not efficient while working with large number of... (1 Reply)
08-18-2016
How to read one row at time using shell script?
