01-28-2009
sed in while loop producing arithmetic output
Hi all
Just wondering if someone can help me with this. I'm trying to write a script that processes the output of another file and prints only the lines I want from it.
This is only the second script I have written so please bare with me here. I have referred to the literature and some of the previous posts and I'm sure I have the logic and syntax correct. It computes, but it takes ages and gives me the wrong output.
heres the code:
#Set the line number variables
filelinenumber=1
datalinenumber=8
lines=`sed -n '$=' test1.out`
while [ $datalinenumber -le $lines ]
do
# print the selected lines into the new file mpck2.out
sed -n "${filelinenumber}p" test1.out` > mpck2.out
sed -n "${datalinenumber}p" test1.out > mpck2.out
# increment the line number variables
filelinenumber=`expr $filelinenumber + 11`
datalinenumber=`expr $datalinenumber + 11`
done
Instead of a file full of the program lines I want I'm just getting this
$ cat mpck2.out
average 156956
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have a forloop which checks a log for a set of 6 static IP addresses and each IP found is logged to a file which is then mailed to me.
After the forloop I always have a text file that may contain up to 6 IP addresses or may contain 0.
What I want to do is substitute the IP addresses (if any)... (2 Replies)
Discussion started by: Moxy
2 Replies
2. Shell Programming and Scripting
I have file with this type of format
01.02.09 08:30
bob
jill
mark
01.04.09 07:00
bob
jill
mark
tom
I want to count the names after the date /ime line (01.02.09 08:30) and add that number after the time like this
01.02.09 08:30 3
01.04.09 07:00 4
I don't care about... (6 Replies)
Discussion started by: marcelino
6 Replies
3. Shell Programming and Scripting
Hi all,
Could someone please advise what is the correct syntax for my little script to process a table of values?
The table is as follows:
0.002432 20.827656
0.006432 23.120364
0.010432 25.914184
0.014432 20.442655
0.018432 20.015243
0.022432 21.579517
0.026432 18.886874... (9 Replies)
Discussion started by: euval
9 Replies
4. Shell Programming and Scripting
Hello everyone,
I need some assistance with what I thought would have been a very simple script.
Purpose of Script:
Script will parse through a source file and modify (search/replace) certain patterns and output to stdout or a file. Script will utilize a "control file" which will contain... (12 Replies)
Discussion started by: packetjockey
12 Replies
5. Shell Programming and Scripting
Hi
I have a file with 3 columns. say,
infile:
1 50 68
34 3 23
23 4 56
-------
-------
I want to generate n files from this file using a loop so that 1st column in output file is (column1 of infile/(2*n+2.561))
I am doing like this:
for ((i=1; i<=3; i++))
do
a=`echo... (3 Replies)
Discussion started by: Surabhi_so_mh
3 Replies
6. Shell Programming and Scripting
Hi
I want to perform arithmetic operations on output of `wc -l`.
for example
user046@sshell ~ $ ls -l
total 0
where "total 0" will increase one line in wc -l
filecount=`ls -l | wc -l`
here $filecount will be 1 but is should be 0
how to get rid of it ? (1 Reply)
Discussion started by: anandgodse
1 Replies
7. Shell Programming and Scripting
Hey guys, awk is putting out too many results, two of each specifically. See below.
Code:
read CPU_VENDOR_ID <<< $(cat /proc/cpuinfo | grep "vendor_id" | awk -F: '{print $2}')
echo $CPU_VENDOR_ID
echo
Output:
AuthenticAMD AuthenticAMD
I only want it to print out "AuthenticAMD" once.
... (7 Replies)
Discussion started by: 3therk1ll
7 Replies
8. Shell Programming and Scripting
My original post did not show up properly. I am trying again.
I have a simple tsch script that does some basic arithmetic. The calculated value was not producing the result I was expecting. I wrote a sample script to illustrate the things that I tried.
#!/bin/tcsh
@ count = 43
@... (3 Replies)
Discussion started by: sgualandri
3 Replies
9. Shell Programming and Scripting
Hi,
I have a text file with some thousands of rows of the following kind (this will be referred to as the inputFileWithColorsAndNumbers.txt):
Blue 6
Red 4
Blue 3
Yellow 4
Red 7
Colors in the left column and a number in the right one for each line. I want to run an awk... (5 Replies)
Discussion started by: Zooma
5 Replies
10. Shell Programming and Scripting
So I am writing a bash script that will search a file line by line for unix timestamps, store all of the timestamps into an array, then check how many of those timestamps were created within the last hour, and finally increment a counter every time it finds a timestamp created within the last hour.... (6 Replies)
Discussion started by: jsikarin
6 Replies
SCRIPT(1) User Commands SCRIPT(1)
NAME
script - make typescript of terminal session
SYNOPSIS
script [options] [file]
DESCRIPTION
script makes a typescript of everything displayed on your terminal. It is useful for students who need a hardcopy record of an interactive
session as proof of an assignment, as the typescript file can be printed out later with lpr(1).
If the argument file is given, script saves the dialogue in this file. If no filename is given, the dialogue is saved in the file type-
script.
OPTIONS
-a, --append
Append the output to file or to typescript, retaining the prior contents.
-c, --command command
Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves
differently when its stdout is not a tty.
-e, --return
Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n.
-f, --flush
Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can
supervise real-time what is being done using `cat foo'.
--force
Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic
link.
-q, --quiet
Be quiet (do not write start and done messages to standard output).
-t[file], --timing[=file]
Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field
indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time.
This information can be used to replay typescripts with realistic typing and output delays.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
NOTES
The script ends when the forked shell exits (a control-D for the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not
set) for the C-shell, csh(1)).
Certain interactive commands, such as vi(1), create garbage in the typescript file. script works best with commands that do not manipulate
the screen, the results are meant to emulate a hardcopy terminal.
It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to
unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for
example the .profile file, which is read by login shells only:
if test -t 0 ; then
script
exit
fi
You should also avoid use of script in command pipes, as script can read more input than you would expect.
ENVIRONMENT
The following environment variable is utilized by script:
SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed.
(Most shells set this variable automatically).
SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1)
HISTORY
The script command appeared in 3.0BSD.
BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects.
script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the
session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See
the NOTES section for more information.
AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
/util-linux/>.
util-linux June 2014 SCRIPT(1)