Sponsored Content
Top Forums Shell Programming and Scripting Basic line reading and file merge question Post 302641567 by Golpette on Wednesday 16th of May 2012 09:13:11 AM
Old 05-16-2012
Basic line reading and file merge question

No doubt these questions have been answered many times, but I struggled to find them - sorry. 2 questions:

1. I wish to read in a file one line at a time and do 'stuff' with it, such as:

Code:
file="tst2"
while IFS= read -r line
do

    echo `wget -qO - http://cactus.nci.nih.gov/chemical/structure/$line/smiles` >> smiles.txt
   
done <"$file"

If 'line' has 6 columns and I want only $4, how do I insert only that column into the web address rather the whole line?


2. If I have 2 files A & B, both having multiple columns, how do I take these 2 files and create a new file with columns in the format A2, B1, A3. Where A2 denotes the 2nd column from file A etc.


Many thanks
 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Basic file processing question

I have a csv file with 3 columns. Column 1 is a date "mm/dd/yyyy", column 2 is a dollar amount (e.g. "100.00") & column 3 in a description of where the transaction took place (e.g. "CHECK CRD PURCHASE 10/07 ACME INC USA") so... "10/01/2009","100.00", "CHECK CRD PURCHASE 10/07 ACME INC USA" I... (1 Reply)
Discussion started by: watingo
1 Replies

2. Shell Programming and Scripting

Monitoring a file - Basic Bash Question

*This is not homework I am new to UNIX and want to try this Monitoring a file demo* *If this is the wrong forum please move it - im new to the forums* $1 = the file to be monitored $2 = the time for the file to sleep If the file gets changed (using -nt) it will send my username mail saying... (2 Replies)
Discussion started by: Nolan-
2 Replies

3. Shell Programming and Scripting

[Solved] Problem in reading a file line by line till it reaches a white line

So, I want to read line-by-line a text file with unknown number of files.... So: a=1 b=1 while ; do b=`sed -n '$ap' test` a=`expr $a + 1` $here do something with b etc done the problem is that sed does not seem to recognise the $a, even when trying sed -n ' $a p' So, I cannot read... (3 Replies)
Discussion started by: hakermania
3 Replies

4. Shell Programming and Scripting

Reading text file, comparing a value in a line, and placing only part of the line in a variable?

I need some help. I would like to read in a text file. Take a variable such as ROW-D-01, compare it to what's in one line in the text file such as PROD/VM/ROW-D-01 and only input PROD/VM into a variable without the /ROW-D-01. Is this possible? any help is appreciated. (2 Replies)
Discussion started by: xChristopher
2 Replies

5. Shell Programming and Scripting

Comparison of fields then increment a counter reading line by line in a file

Hi, i have a scenario were i should compare a few fields from each line then increment a variable based on that. Example file 989878|8999|Y|0|Y|N|V 989878|8999|Y|0|N|N|V 989878|8999|Y|2344|Y|N|V i have 3 conditions to check and increment a variable on every line condition 1 if ( $3... (4 Replies)
Discussion started by: selvankj
4 Replies

6. Shell Programming and Scripting

Reading line by line from live log file using while loop and considering only those lines start from

Hi, I want to read a live log file line by line and considering those line which start from time stamp; Below code I am using, which read line but throws an exception when comparing line that does not contain error code tail -F /logs/COMMON-ERROR.log | while read myline; do... (2 Replies)
Discussion started by: ketanraut
2 Replies

7. Solaris

Basic question regarding root file system copy to another disk

Hello, I am creating a new disk using the following command: dd if=/dev/zero of=/export/home/ramdisk/0 bs=512 count=4096k after creating the disk, i tool a ufsdump of a solaris 10 filesytem (disk size 512MB) ufsdump -cvf /export/home/ufsdump/sol_orig /and then restored the dump files onto... (10 Replies)
Discussion started by: Zam_1234
10 Replies

8. UNIX for Beginners Questions & Answers

Basic Linux command line question

:D:D:D These are list of command i typed on opensuse terminal and evolve lots of doubt around ,that i can't answer. COMMAND 1 linux-xavv:/ # cd COMMAND 2 linux-xavv:~ # Does above command 1 and command two with red labelled sign make different meaning or same . 1 linux-xavv:/... (1 Reply)
Discussion started by: lobsang
1 Replies

9. UNIX for Beginners Questions & Answers

Reading a file line by line and print required lines based on pattern

Hi All, i want to write a shell script read below file line by line and want to exclude the lines which contains empty value for MOUNTPOINT field. i am using centos 7 Operating system. want to read below file. # cat /tmp/d5 NAME="/dev/sda" TYPE="disk" SIZE="60G" OWNER="root"... (4 Replies)
Discussion started by: balu1234
4 Replies
DPKG-RECONFIGURE(8)						      Debconf						       DPKG-RECONFIGURE(8)

NAME
dpkg-reconfigure - reconfigure an already installed package SYNOPSIS
dpkg-reconfigure [options] packages DESCRIPTION
dpkg-reconfigure reconfigures packages after they have already been installed. Pass it the names of a package or packages to reconfigure. It will ask configuration questions, much like when the package was first installed. If you just want to see the current configuration of a package, see debconf-show(1) instead. OPTIONS
-ftype, --frontend=type Select the frontend to use. The default frontend can be permanently changed by: dpkg-reconfigure debconf Note that if you normally have debconf set to use the noninteractive frontend, dpkg-reconfigure will use the dialog frontend instead, so you actually get to reconfigure the package. -pvalue, --priority=value Specify the minimum priority of question that will be displayed. dpkg-reconfigure normally shows low priority questions no matter what your default priority is. See debconf(7) for a list. --default-priority Use whatever the default priority of question is, instead of forcing the priority to low. -a, --all Reconfigure all installed packages that use debconf. Warning: this may take a long time. -u, --unseen-only By default, all questions are shown, even if they have already been answered. If this parameter is set though, only questions that have not yet been seen will be asked. --force Force dpkg-reconfigure to reconfigure a package even if the package is in an inconsistent or broken state. Use with caution. --no-reload Prevent dpkg-reconfigure from reloading templates. Use with caution; this will prevent dpkg-reconfigure from repairing broken templates databases. However, it may be useful in constrained environments where rewriting the templates database is expensive. -h, --help Display usage help. SEE ALSO
debconf(7) AUTHOR
Joey Hess <joeyh@debian.org> 2012-12-21 DPKG-RECONFIGURE(8)
All times are GMT -4. The time now is 03:42 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy