...that the LAST newline was removed and to be aware of it. I always use "echo -n..."
as a double check to see if the trailing newline exists or not after such an event.
I am pretty sure some time ago you corrected me on "cat" stripping trailing newlines
when being placed into a variable and since then I check every command that does a
similar thing; "sed' seems no exception so far, unless I am missing something...
Sorry, I didn't mean to tease you.
But, I'm sure the "last" newline is NOT removed by sed. What it does is it removes the ENTIRE last line - including THAT newline - but nothing else. So, the before last line - including its newline - is left intact.
...that the LAST newline was removed and to be aware of it. I always use "echo -n..."
as a double check to see if the trailing newline exists or not after such an event.
That's a pointless habit. There is no need to check. Rest assured, any trailing newlines will be stripped by command substitution. Always.
Note that the newlines are not discarded by the command (sed, cat, or what have you), but by the shell itself after it receives the output from the command. It not only strips a single trailing newline; it will strip as many trailing newlines as may be present.
The shell shall expand the command substitution by executing command in a subshell environment (see Shell Execution Environment) and replacing the command substitution (the text of command plus the enclosing "$()" or backquotes) with the standard output of the command, removing sequences of one or more <newline>s at the end of the substitution. Embedded <newline>s before the end of the output shall not be removed; however, they may be treated as field delimiters and eliminated during field splitting, depending on the value of IFS and quoting that is in effect.
Thanks to all, especially Rudi C. I was able to use the command
Code:
sed '/NEW/ {1d;$d;}'
successfully and also save time because when I created the script it actually was removing and replacing the NEW lines more than once so it didn't work on all the files that I was feeding it. These tutorials really helped!
Hi Guys ,
I am having a file as stated below
File 1
sa0 -- i_core/i_core_apb/i_afe0_controller/U261/A
sa0 -- i_core/i_core_apb/i_afe0_controller/U265/Z
sa1 -- i_core/i_core_apb/i_afe0_controller/U265/A
sa1 -- i_core/i_core_apb/i_afe0_controller/U268/Z
sa1 -- ... (7 Replies)
here is what i want to achieve.. i have a file with below contents
cat fileName
blah blah blah
.
.DROP this
REJECT that
.
--sport 7800 -j REJECT --reject-with icmp-port-unreachable
--dport 7800 -j REJECT --reject-with icmp-port-unreachable
.
.
.
more blah blah blah
--dport 3306... (14 Replies)
I want to delete the last word of each line in all the files in one directory but dont know what I am doing wrong
FILES="data/*"
for X in $FILES
do
name=$(basename $X)
sed s/'\w*$'// $X > no-last/${name}
done
Can you please help me :wall: (8 Replies)
Hi,
I have gone through may posts and dint find exact solution for my requirement.
I have file which consists below data and same file have lot of other data.
<MAPPING DESCRIPTION ='' ISVALID ='YES' NAME='m_TASK_UPDATE' OBJECTVERSION ='1'>
<MAPPING DESCRIPTION ='' ISVALID ='NO'... (11 Replies)
I have a line that gets pulled from a database that has a variable number of fields, fields can also be of a variable size. Each field has a variable number of spaces between them so there is no 'defined' delimiter. The LastData block is always a single word.
What I want to do is delete the... (2 Replies)
I'm new to using sed and grep commands, but have found them extremely useful. However I am having a hard time figuring this one out:
Delete every line containing the word CEN and the next line as well.
ie. test.txt
blue
324 CEN
green
red
blue
324 CEN
green
red
blue
to produce:... (2 Replies)
write a shell script that deletes all lines containing a specified word in one or more files supplied as arguments to it.help is appreciated .thank you. (2 Replies)
Hi Canone please provide me solution how can achieve the result below:
File1.txt
$
sweet appleŁ1
scotish
green
$
This is a test1
$
sweet mangoŁ2
asia
yellow
$
This is a test 2
$
sweet apple red (there is no pound symbol here)
germany
green (1 Reply)
Hi I have a text file like this name today.txt
the request has been accepted
the scan is successful at following time
there are no invalid packages
5169378 : map : Permission Denied
the request has been accepted
Now what i want do is
I want to search the today.txt file and
if i... (1 Reply)
How would I delete everything on a line in a file prior to a specific word?
In other words, I have a file that contains the word SEARCH on various lines and would like to delete everything prior to SEARCH on all lines. Thanks for that help (2 Replies)
09-25-2013
