07-17-2012
Your shell is likely running the read in a subshell. The variables are set there, but unset when you try to use them in the parent shell. You could try either writing the pipeline to a temp file and reading that, using process substution/here-string/here-doc to redirect the result of a command substitution into the read, or doing all the work with those variables in the subshell where read runs.
Regards,
Alister
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi. I'm trying to write a script that reads a line on a file and runs a different command for a different line output.
For example, if it finds the word "Kuku" on the line it sends mail to Kuku@kuku.com. Otherwise, it sends mail to Lulu@lulu.com.
TIA. (2 Replies)
Discussion started by: Doojek9
2 Replies
2. UNIX for Dummies Questions & Answers
I use the cat command to concatenate text files, but one of the rows I was expecting doesn't display in the output file. Is there a verbose mode\logging mechanism for the cat command to help me investigate where the lines I was expecting are going??
cat 7760-001_1_*_06_*.txt | grep -v... (1 Reply)
Discussion started by: Xin Xin
1 Replies
3. UNIX for Dummies Questions & Answers
Hi,
how do I read in a file which includes a list of workstations and then run a command for each workstation ?
I am unclear which command to use to read in , or is this not possible ?
Thanks, (3 Replies)
Discussion started by: manni2
3 Replies
4. Shell Programming and Scripting
Hi I would appreciate your help with this.
I have a output file from a command. It is broken based on initial of the users. Exmaple of iitials MN & SS. Under each section there is information pertaining to the user however each section can have different number of lines. MY challenge is to ... (5 Replies)
Discussion started by: mnassiri
5 Replies
5. Shell Programming and Scripting
Hi,
I need help with this-
input.txt :
L B white
X Y white
A B brown
M Y black
Read this input file and if 3rd column is "white", then add specific lines to another file insert.txt.
If 3rd column is brown, add different set of lines to insert.txt, and so on.
For example, the given... (6 Replies)
Discussion started by: prashob123
6 Replies
6. Shell Programming and Scripting
OS : Red Hat Linux 6.4
Shell : Bash
We have a file called status.txt which will have only 1 line. The content will be the string "Processing" for most of the day.
# cat status.txt
Processing
#I want to write a shell script (notify.sh) which will be executing a grep every 10 minutes .
... (7 Replies)
Discussion started by: kraljic
7 Replies
7. Shell Programming and Scripting
Hi
I have jobs (some 1000) defined in a file and I want to read those jobs and run a a command.
For example:
jobs.txt
abc
efg
I want to read the entire file and run the following command
Delete -JOB "abc"
Deleteing abc...
Delete -JOB "efg"
Delete efg...
Can somebody help me... (4 Replies)
Discussion started by: karan8810
4 Replies
8. Shell Programming and Scripting
Sample Data
#cat /mylist.txt
/raid/job/123
/raid/job/456
/raid/job/789
#
Script
#cat /myfind.scr
#!/bin/bash
touch /nojob.txt
touch /job.txt
unset dirfolder
for dirfolder in `/bin/cat /mylist.txt`;do
if
then
echo $dirfolder >>/job.txt
else
echo $dirfolder >>/nojob.txt (3 Replies)
Discussion started by: crowman
3 Replies
9. Shell Programming and Scripting
hi,
i'm trying to write a tcsh script that reads in a text file (one column) and the runs a different command for each line of text.
i've found lots of example commands for bash, but not for tcsh.
can anyone give me a hint?
thanks,
jill (8 Replies)
Discussion started by: giuinha
8 Replies
10. Programming
Experts,
I am writing a script and able to write only small piece of code and not able to collect logic to complete this task.
In input file have to look for name like like this (BGL_HSR_901_1AG_A_CR9KTR10) before sh iss neors. Record this (BGL_HSR_901_1AG_A_CR9KTR10) in csv file
Now have to... (0 Replies)
Discussion started by: as7951
0 Replies
UNIQ(1) BSD General Commands Manual UNIQ(1)
NAME
uniq -- report or filter out repeated lines in a file
SYNOPSIS
uniq [-c | -d | -u] [-i] [-f num] [-s chars] [input_file [output_file]]
DESCRIPTION
The uniq utility reads the specified input_file comparing adjacent lines, and writes a copy of each unique input line to the output_file. If
input_file is a single dash ('-') or absent, the standard input is read. If output_file is absent, standard output is used for output. The
second and succeeding copies of identical adjacent input lines are not written. Repeated lines in the input will not be detected if they are
not adjacent, so it may be necessary to sort the files first.
The following options are available:
-c Precede each output line with the count of the number of times the line occurred in the input, followed by a single space.
-d Only output lines that are repeated in the input.
-f num Ignore the first num fields in each input line when doing comparisons. A field is a string of non-blank characters separated from
adjacent fields by blanks. Field numbers are one based, i.e., the first field is field one.
-s chars
Ignore the first chars characters in each input line when doing comparisons. If specified in conjunction with the -f option, the
first chars characters after the first num fields will be ignored. Character numbers are one based, i.e., the first character is
character one.
-u Only output lines that are not repeated in the input.
-i Case insensitive comparison of lines.
ENVIRONMENT
The LANG, LC_ALL, LC_COLLATE and LC_CTYPE environment variables affect the execution of uniq as described in environ(7).
EXIT STATUS
The uniq utility exits 0 on success, and >0 if an error occurs.
COMPATIBILITY
The historic +number and -number options have been deprecated but are still supported in this implementation.
SEE ALSO
sort(1)
STANDARDS
The uniq utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002.
HISTORY
A uniq command appeared in Version 3 AT&T UNIX.
BSD
December 17, 2009 BSD