I never thought of doing that, but it's a nice idea. Do you not need a redirect to the output file?
I am still not sure if this will be a standalone script or part of a larger script, so I'm not yet sure where the values of the two input files and the output file will be coming from. For now, I wrote them out as bash variables, partly because $header_file will make more sense to me than $1 when I look at this next week.
It's good to know about the resource limits. I theory, there could be millions of rows but there will never be all that many columns (<100). I will test on some larger files and report back if I run into any limitations.
Hi,
I have several text files each containing some data as shown below:
File1.txt
>DataHeader
Data...
Data...
File2.txt
>DataHeader
Data...
Data...
etc.
What I want is to change the 'DataHeader' based on the file name. So the output should look like:
File1.txt
>File1
... (1 Reply)
Hi,
I need helping in finding some of the text in one file and some columns which have same column in file 1
EG
cat file_1
aaaa
bbbb
cccc
dddd
eeee
fffff
gggg
hhhh
cat file_2
aaaa,abcd,effgh,ereref,name,age,sex,...........
bbbb,efdfh,erere,afdafds,name,age,sex.............. (1 Reply)
Hi All,
I have some data like below.
Step1,Param1,Param2,Param3
1,2,3,4
2,3,4,5
2,4,5,6
3,0,1,2
3,0,0,0
3,2,1,3
........
so on
Where I need to find the median(arithmetic) of each column from Param1...to..Param3 for each set of Step1 values.
(Sort each specific column, if the... (5 Replies)
Hi All,
I want to remove the content based on the header information .
Please find the example below.
File1.txt
Name|Last|First|Location|DepId|Depname|DepLoc
naga|rr|tion|hyd|1|wer|opr
Nava|ra|tin|gen|2|wera|opra
I have to search for the DepId and remove the data from the... (5 Replies)
Hi All,
I need the modification for the below mentioned code (found in one more post https://www.unix.com/shell-programming-scripting/27161-script-generate-average-values.html) to find the average values for all the columns(but for a specific rows) and print the averages side by side.
I have... (4 Replies)
Hi,
I have two input files; file1 and file2. I compare them based on matched values in 1 column and print selected columns of the second file (file2). I got the result but the header was not printed. i want the header of file2 to be printed together with the result. Then i did below codes:-
... (3 Replies)
Hello,
I have some tab delimited text files with a three header rows. The headers look like, (sorry the tabs look so messy).
index group Name input input input input input input input input input input input... (9 Replies)
Hi Friends,
I have files with columns like this. This sample input below is partial.
Please check below for main file link. Each file will have only two rows.
... (8 Replies)
I've been struggling with this one for quite a while and cannot seem to find a solution for this find/replace scenario. Perhaps I'm getting rusty.
I have a file that contains a number of metrics (exactly 3 fields per line) from a few appliances that are collected in parallel. To identify the... (3 Replies)
Hi All,
i am trying to print required multiple columns dynamically from a fie.
But i am able to print only one column at a time.
i am new to shell script, please help me on this issue.
i am using below script
awk -v COLT=$1 '
NR==1 {
for (i=1; i<=NF; i++) {
... (2 Replies)
Discussion started by: balu1234
2 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)