05-14-2009
Quote:
Originally Posted by
ghostdog74
just in case file is big,
If the file is large, you shouldn't be using a shell loop.
Quote:
putting IFS outside of while loop will be beneficial.
Putting IFS outside the loop has the disadvantage of changing it for commands inside the body of the loop as well as for the read command.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi All,
I have a table with 10 columns. Some columns(2nd,4th,5th,7th,8th and 10th) are Not Null columns. I'll get a tab-delimited file and want to check col by col and generate seperate error code for each col eg:102 if 2nd col value is NULL and 104 if 4th col value is NULL so on... I am a... (7 Replies)
Discussion started by: Mandab
7 Replies
2. Shell Programming and Scripting
file1.txt :
india pakistan bangladesh
japan canada africa
USA srilanka Nepal
file2.txt
Delhi
Tokyo
washington
I have to cut the first column of file1.txt and apend it with file2.txt as another column like this
Delhi india
Tokyo japan
washington USA
... (4 Replies)
Discussion started by: sakthifire
4 Replies
3. Shell Programming and Scripting
Hi, Iam new to unix. I have one input file .
Input file :
ID1~Name1~Place1
ID2~Name2~Place2
ID3~Name3~Place3
I need output such that only first column should change to fixed width column of 15 characters of length.
Output File:
ID1<<12 spaces>>Name1~Place1
ID2<<12... (5 Replies)
Discussion started by: manneni prakash
5 Replies
4. Shell Programming and Scripting
Match column 3 in file1 to column 1 in file 2 and replace with column 2 from file2
file 1 sample
SNDK 80004C101 AT
XLNX 983919101 BB
NETL 64118B100 BS
AMD 007903107 CC
KLAC 482480100 DC
TER 880770102 KATS
ATHR 04743P108 KATS... (7 Replies)
Discussion started by: rydz00
7 Replies
5. Shell Programming and Scripting
Hi friends,
My file is like:
Second file is :
I need to print the rows present in file one, but in order present in second file....I used
while read gh;do
awk ' $1=="' $gh'" {print >> FILENAME"output"} ' cat listoffirstfile
done < secondfile
but the output I am... (14 Replies)
Discussion started by: CAch
14 Replies
6. Shell Programming and Scripting
Can anyone please help with this? I have 2 files as given below.
If 2nd column of file1 has pattern foo1@a, find the matching 1st column in file2 & replace 2nd column of file1 with file2's value.
file1
abc_1 foo1@a ....
abc_1 soo2@a ...
def_2 soo2@a ....
def_2 foo1@a ........ (7 Replies)
Discussion started by: prashali
7 Replies
7. Shell Programming and Scripting
Hi,
I have two input files as
File1 :
ABC:client1:project1
XYZ:client2-aa:project2
DEF:client4:proj
File2 :
client1:W-170:xx
client2-aa:WT-04:yy
client4:L-005A:zz
Also, array of valid values can be hardcoded like
Output :
ABC:W:project1
XYZ:WT:project2 (1 Reply)
Discussion started by: aa2601
1 Replies
8. Shell Programming and Scripting
Hello,
I have two files as the following:
File1:
F0100020 A G
F0100030 A T
F0100040 A G
File2:
F0100040 A G BTA-28763-no-rs 77.2692
F0100030 A T BTA-29334-no-rs 11.4989
F0100020 A G BTA-29515-no-rs 127.006
I want to sort the second file based on the... (6 Replies)
Discussion started by: Homa
6 Replies
9. UNIX for Beginners Questions & Answers
hi
I have 2 file with more than 10 columns for both
1st file
apple,0,0,0......
orange,1,2,3.....
mango,2,4,5.....
2nd file
apple,2,3,4,5,6,7...
orange,2,3,4,5,6,8...
watermerlon,2,3,4,5,6,abc...
mango,5,6,7,4,6,def.... (1 Reply)
Discussion started by: tententen
1 Replies
10. UNIX for Beginners Questions & Answers
I have data of an excel files as given below,
file1
org1_1 1 1 2.5 100
org1_2 1 2 5.5 98
org1_3 1 3 7.2 88
file2
org2_1 1 1 2.5 100
org2_2 1 2 5.5 56
org2_3 1 3 7.2 70
I have multiple excel files as above shown.
I have to copy column 1, column 4 and paste into a new excel file as... (26 Replies)
Discussion started by: dineshkumarsrk
26 Replies
COLRM(1) BSD General Commands Manual COLRM(1)
NAME
colrm -- remove columns from a file
SYNOPSIS
colrm [start [stop]]
DESCRIPTION
The colrm utility removes selected columns from the lines of a file. A column is defined as a single character in a line. Input is read
from the standard input. Output is written to the standard output.
If only the start column is specified, columns numbered less than the start column will be written. If both start and stop columns are spec-
ified, columns numbered less than the start column or greater than the stop column will be written. Column numbering starts with one, not
zero.
Tab characters increment the column count to the next multiple of eight. Backspace characters decrement the column count by one.
ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).
EXIT STATUS
The colrm utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
awk(1), column(1), cut(1), paste(1)
HISTORY
The colrm command appeared in 3.0BSD.
BSD
August 4, 2004 BSD