Hello all.
Sorry, I know this question is similar to many others, but I just can seem to put together exactly what I need.
My file is tab delimitted and contains approximately 1 million rows. I would like to send lines 1,4,& 7 to a file. Lines 2, 5, & 8 to a second file. Lines 3, 6, & 9 to... (11 Replies)
Dear all,
I have a large file which is composed of 8000 frames, what i would like to do is split the file into 8000 single files names file.pdb.1, file.pdb.2 etc etc
each frame in the large file is seperated by a "ENDMDL" flag so my thinking is to use this flag a a point to split the files... (4 Replies)
Hi Friends,
Below is my requirement. I have a file with the below structure.
0001A1....
0001B1..
....
0001L1
0002A1
0002B1
......
0002L1
..
the first 4 characters are the sequence numbers for a record, A record will start with A1 and end with L1 with same sequence number. Now the... (2 Replies)
I need to split a file if it is over 2GB in size (or any size), preferably split on the lines. I have figured out how to get the file size using awk, and I can split the file based on the number of lines (which I got with wc -l) but I can't figure out how to connect them together in the script.
... (6 Replies)
Hi ,
I have huge files around 400 mb, which has clob data and have diffeent scenarios:
I am trying to pass scenario number as parameter and and get required modified file based on the scenario number and criteria.
Scenario 1:
file name : scenario_1.txt
... (2 Replies)
Hi,
I have a Huge 7 GB file which has around 1 million records, i want to split this file into 4 files to contain around 250k messages each.
Please help me as Split command cannot work here as it might miss tags..
Format of the file is as below
<!--###### ###### START-->... (6 Replies)
Hi
i have requirement like below
M <form_name> sdasadasdMklkM
D ......
D .....
M form_name> sdasadasdMklkM
D ......
D .....
D ......
D .....
M form_name> sdasadasdMklkM
D ......
M form_name> sdasadasdMklkM
i want split file based on line number by finding... (10 Replies)
Hello All,
I have records in a file in a pattern A,B,B,B,B,K,A,B,B,K
Is there any command or simple logic I can pull out records into multiple files based on A record? I want output as
File1: A,B,B,B,B,K
File2: A,B,B,K (9 Replies)
I have a file that is about 7 GB in size. The requirement is I should split the file equally in such a way that the size of the split files is less than 2Gb. If the file is less than 2gb, than nothing needs to be done. ( need to done using shell script)
Thanks, (4 Replies)
Hi,
I have a directory in Unix and there are folders available in the directory.
Files are created on different month and now i have a requirement to calculate size of the folder on month basis.
Is there any Unix command to check this please??
Thanks (6 Replies)
Discussion started by: Nivas
6 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)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 v5.16.3 2010-06-11 SHELL-QUOTE(1)