---------- Post updated at 09:28 PM ---------- Previous update was at 06:59 PM ----------
Just one question
those 2 command give the same output (I added -e to echo for interpreting special characters)
Code:
echo -e "s/$/\\n/"
echo -e "s/$/\n/"
why in the first is not new line escaped ? If I want this I have to type like
Code:
echo -e "s/$/\\\n/"
Only thing which gives me sence is if first \ escapes second, so second \ is written and it escapes \n
But also this gives me the same result as previous and this gives me no sence
Code:
echo -e "s/$/\\\\n/"
I assumed first escapes second (so far second \ is written because is escaped by first \), written \ (the second) escapes third \ (so third is also written) which escapes \n.
so my expected result is: s/$/\\\n/ and NOT s/$/\n/
Can someone explain that ?
I am asking because I have traouble write something like this into the script
Code:
sed "$res""s/$/\\\\\n"$name"\\\\\n"$name"\\\/
if i type it directly to bash it runs with no problems
I have a file called products.kp which contains, for example,
12345678,1^M
87654321,2^M
13579123,3
when I run the command
cat products.kp| sed -f kp.sed
where kp.sed contains
s,^M,,
I get the output
12345678,1
87654321,2
13579123,3 (5 Replies)
I have searched far and wide for an explanation for some odd behavior for output redirection and haven't come up with anything.
A co-worker was working on old scripts which have run for years and embedded in their code were output redirects which worked for the script during execution and then... (5 Replies)
Dear guys;
when deleting repeated lines using nawk as below ;
Why the below syntax works?
nawk ' !a++' infile > outfile
and when using the other below syntax the nawk doesn't work?
nawk ' { !a++ } ' infile > outfile
or
nawk '
{
!a++
} ' infile > outfile
BR (4 Replies)
I have the following program:
int main(int argc, char** argv){
unsigned long int mean=0;
for(int i=1;i<10;i++){
mean+=poisson(12);
cout<<mean<<endl;
}
cout<<"Sum of poisson: "<< mean;
return 0;
}
when I run it, I get the... (4 Replies)
Hi
I have script to to take backup and send mail to a group once a day.
One strange behavior I have observed recently is that most of the time the mail we receive is fine . But someday it just sends out mail without any subject with undisclosed recipients. I dont know how to find the cause... (0 Replies)
I am not sure what is wrong, but I have some strange behavior when printing things out.
I do create a file with only one word test, no space, no new line etc.
nano file<enter>
test<ctrl x>y<enter>
Server 1 gets (fail)
awk '{print "+"$0"*"}' file
*test
Server 2 gets (OK)
awk '{print... (9 Replies)
I am trying to create an archive using tar. I am specifying a list of directories using the -L option. For testing purposes I created a simple directory structure:
/backup/test
/backup/test/test1
/backup/test/test2
The file specified by the -L option, named files.txt, contains:... (8 Replies)
Hi All,
I am facing a strange problem while grepping for a process. Here is the small script that i have written.
It will look for any process running with the parameter passed to the script.
If no process is running it should print appropriate message.
$ cat t.ksh
#!/bin/ksh
set -x
... (9 Replies)
Hello All,
I have a strange issue. I've created a shell script which connects to RMAN (Oracle Recovery Manager) and executes full DB backup. I then executed this script with nohup and in the background:
$ nohup my_script.sh > logfile.log 2>&1 &The issue is that when I tried to take a look into... (6 Replies)
Discussion started by: JackK
6 Replies
LEARN ABOUT LINUX
echo
ECHO(1) User Commands ECHO(1)NAME
echo - display a line of text
SYNOPSIS
echo [SHORT-OPTION]... [STRING]...
echo LONG-OPTION
DESCRIPTION
Echo the STRING(s) to standard output.
-n do not output the trailing newline
-e enable interpretation of backslash escapes
-E disable interpretation of backslash escapes (default)
--help display this help and exit
--version
output version information and exit
If -e is in effect, the following sequences are recognized:
\ backslash
a alert (BEL)
backspace
c produce no further output
e escape
f form feed
new line
carriage return
horizontal tab
v vertical tab
NNN byte with octal value NNN (1 to 3 digits)
xHH byte with hexadecimal value HH (1 to 2 digits)
NOTE: your shell may have its own version of echo, which usually supersedes the version described here. Please refer to your shell's docu-
mentation for details about the options it supports.
AUTHOR
Written by Brian Fox and Chet Ramey.
REPORTING BUGS
Report echo bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report echo translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for echo is maintained as a Texinfo manual. If the info and echo programs are properly installed at your site, the
command
info coreutils 'echo invocation'
should give you access to the complete manual.
GNU coreutils 8.5 February 2011 ECHO(1)
03-17-2010
