|
|
Sponsored Content
Top Forums
Shell Programming and Scripting
Using tr, sed or awk to delete text from nth column only
Post 302552263 by hlwright on Friday 2nd of September 2011 07:00:04 AM
09-02-2011
Using tr, sed or awk to delete text from nth column only
Hi everyone, this is my first post here, I hope someone can help me.
I have a file which I need to delete characters '_F3' from the end of the text in the first column. The problem is that the characters may also occur elsewhere in the file (i.e. second columns onwards). I tried sed (thinking I was a linux genius) and then realised that there were rows where the character is not in the first column, but appears in a later column, and I was deleting the second occurrence of '_F3' when I only actually want to delete it if it is in the first column.
The command I was using was:
I need to retain everything in the file except the trailing _F3 in the first column, and write to a new file.
I have spent ~3h trying to find a solution to this, and think its probably an awk command I need, but I am afraid my awk skills are 0.
Please can someone help me out!
Many thanks
Helen
I have a file which I need to delete characters '_F3' from the end of the text in the first column. The problem is that the characters may also occur elsewhere in the file (i.e. second columns onwards). I tried sed (thinking I was a linux genius) and then realised that there were rows where the character is not in the first column, but appears in a later column, and I was deleting the second occurrence of '_F3' when I only actually want to delete it if it is in the first column.
The command I was using was:
PHP Code:
sed 's/_F3//' filename > newfilename
I have spent ~3h trying to find a solution to this, and think its probably an awk command I need, but I am afraid my awk skills are 0.
Please can someone help me out!
Many thanks
Helen
|
|
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello, guys!
"filename" has blocks with three lines each in this fashion:
93909286
#verified
has one bug
10909286
#unverified
pending
10909286
#unverified
pendingThe above example has duplicate blocks, and I have tried using sed to remove just one block... The... (2 Replies)
Discussion started by: teresaejunior
2 Replies
2. Shell Programming and Scripting
I have an awk script to find the maximum value of the 2nd column of a 2 column datafile, but I need to find the top 5 maximum values of the 2nd column.
Here is the script that works for the maximum value.
awk 'BEGIN { subjectmax=$1 ; max=0} $2 >= max {subjectmax=$1 ; max=$2} END {print... (3 Replies)
Discussion started by: ncwxpanther
3 Replies
3. Shell Programming and Scripting
Is there an awk script that can easily perform the following operation?
I have a data file that is in the format of
1944-12,5.6
1945-01,9.8
1945-02,6.7
1945-03,9.3
1945-04,5.9
1945-05,0.7
1945-06,0.0
1945-07,0.0
1945-08,0.0
1945-09,0.0
1945-10,0.2
1945-11,10.5
1945-12,22.3... (3 Replies)
Discussion started by: ncwxpanther
3 Replies
4. Shell Programming and Scripting
Hello people,
Once more I need your help with SED/AWK
I need to delete up to the Nth occurence of a char (from the beggining) and until the Mth occurence of a char (from the end)
Example:
Input:
a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z
Output:
i,j
Must delete up to the... (2 Replies)
Discussion started by: drbiloukos
2 Replies
5. Shell Programming and Scripting
Hello Members,
I have a csv file in the format below. Need help with awk statement to break nth column into 3 separate columns and export the changes to new file.
input file --> file.csv
cat file.csv|less
"product/fruit/mango","location/asia/india","type/alphonso"
need output in... (2 Replies)
Discussion started by: awk-admirer
2 Replies
6. Shell Programming and Scripting
I need to be able to search for a string in the first column and if that string exists than replace the nth column with "-9.99".
AW12000012012 2.38 1.51 3.01 1.66 0.90 0.91 1.22 0.82 0.57 1.67 2.31 3.63 0.00
AW12000012013 1.52 0.90 1.20 1.34 1.21 0.67 ... (14 Replies)
Discussion started by: ncwxpanther
14 Replies
7. Shell Programming and Scripting
I am passing a variable and replace nth value with the variable.
I tried using many options in awk command but unable to ignore the special characters in the output and also unable to pass the actual value.
Input : "1","2","3"
Output : "1","1000","3"
TempVal=`echo 1000`
Cat... (2 Replies)
Discussion started by: onesuri
2 Replies
8. Shell Programming and Scripting
Hello Members,
Need your expert opinion how to tackle below.
I have an input file that looks like below:
USS|AWCC|AFGAW|93|70
USSAA|Roshan TDCA|AFGTD|93|72,79
ALB|Vodafone|ALBVF|355|69
ALGEE|Wataniya (Nedjma)|DZAWT|213|50,550
I like output file in below format:
... (7 Replies)
Discussion started by: umarsatti
7 Replies
9. Shell Programming and Scripting
Hi guys,
I have problem to append new data at the end of each line of the files where it takes whole value of the nth column. My expected result i just want to take a specific value only. This new data is based on substring of 11th, 12th 13th column that has comma seperated value.
My code:
awk... (4 Replies)
Discussion started by: null7
4 Replies
10. UNIX for Beginners Questions & Answers
I wish to print first, third and sixth till the last column from the output of ls command
ls -ltr /app/deploy.yml
-rw-rw-r-- 1 user1 dba 27342 Aug 28 10:17 /app/deploy.yml
Desired Output:
Below command gives me the desired output.
ls -ltr /app/deploy.yml | awk '{$2=$4=$5=""; print... (6 Replies)
Discussion started by: mohtashims
6 Replies
LEARN ABOUT REDHAT
column
COLUMN(1) BSD General Commands Manual COLUMN(1) NAME
column -- columnate lists SYNOPSIS
column [-tx] [-c columns] [-s sep] [file ...] DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file operands, or, by default, from the standard input. Empty lines are ignored. The options are as follows: -c Output is formatted for a display columns wide. -s Specify a set of characters to be used to delimit columns for the -t option. -t Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with the characters supplied using the -s option. Useful for pretty-printing displays. -x Fill columns before filling rows. Column exits 0 on success, >0 if an error occurred. ENVIRONMENT
COLUMNS The environment variable COLUMNS is used to determine the size of the screen if no other information is available. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY HH:MM/YEAR NAME " ; ls -l | sed 1d) | column -t SEE ALSO
colrm(1), ls(1), paste(1), sort(1) HISTORY
The column command appeared in 4.3BSD-Reno. BSD
June 6, 1993 BSD