I have a list of lines in variable (1,3,8,9). That list shows which lines I need to delete from a text file. which function I can use to delete specific lines number?
Thank you so much for your respond
# set -vx
lines2del="(1,3,8,9)"
sedCmds=${lines2del//,/d;}
sedCmds=${sedCmds/(/}
sedCmds=${sedCmds/)/}
sedCmds=${sedCmds}d
sed -i "$sedCmds" file
Remove the # before set -vx to see the debug/trace for each cmd as it is executed.
If you don't really have ( ) (parens) around your data, fix the line2del variable and remove the second and third sedCmds= lines.
IHTH
Related
I am trying to delete a set of lines from a file by passing variables.
Below is my file :
$ cat checking.txt
Starting1
DELETE /*+NESTED_TABLE_SET_REFS+*/ FROM tables1
Ending1
Starting2
update table
set col1=2
where val2=685
Ending2
Starting3
update table
set col1=1
where val1=44
Ending3
so in above files I need to delete lines from 1st line to 4th line.
I used below command and it was working fine.
sed '1,4d' checking.txt
Now I gave variable a a value, like a=4
echo $a
4
Now I tried the sed command like
sed "1,${a}d" checking.txt
sed: 0602-404 Function 1, 4d cannot be parsed.
Can someone please tell me how to pass variable here?
Thanks in Advance
One way you could attempt this problem is in the following way. Assuming you want to delete lines between start and stop, you could write
awk '(NR<start) || (stop<NR)' start=1 stop=4 file
The way you are proposing it to work also works,
start=1
stop=4
sed "${start},${stop}d" file
The reason why it failed in your case is because the variable a seems to have blanks in front of it. You notice this from the errormessage and the blanks space in front of the 4.
This question already has answers here:
Editing/Replacing content in multiple files in Unix AIX without opening it
(2 answers)
Closed 6 years ago.
I wonder know if there is a way to edit a conf file without getting in the file and changing the lines?
In my case, I need to edit zabbix-agent conf file (located in /etc/zabbix/zabbix_agentd.conf) and there are some parameters in the file that I need to change, such as Server Name, DebugLevel, and others.
Normally I edit the file using vim and change the lines, but my idea is to edit the file directly from bash, but I don`t know if this is possible.
For example, if I need to change the parameter DebugLevel, at bash I would run:
# /etc/zabbix/zabbix_agentd.conf.DebugLevel=3
This actually doesn`t works, but I would like something like this for my problem...
Does anyone knows??
I tested what David said, but it didn`t solved my problem... There are some lines in the file that is commented and I need to uncomment them, and there are some lines that I just need to change.
For example, the line above:
# DebugLevel=3
I need to change to:
DebugLevel=3
And this line:
Server=127.0.0.1
I need to change for the IP of zabbix server name, like this:
Server=172.217.28.142
Is there any other way?
If I understand your question correctly, then you want sed -i (the -i option allows sed to edit the file in place, and -i.bak will do the same but create a backup of the original file with the .bak extension)
To change DebugLevel=3 to DebugLevel=4 in file /etc/zabbix/zabbix_agentd.conf, you can do:
# sed -i.bak "/DebugLevel/s/[0-9][0-9]*$/4/" /etc/zabbix/zabbix_agentd.conf
If I misinterpreted your question, please let me know.
To Change Values at the End
Example Input File
$ cat file.txt
DebugLevel=3
Example Use
$ sed -i "/DebugLevel/s/[0-9][0-9]*$/4/" file.txt
$ cat file.txt
DebugLevel=4
To Remove Comments
You can do virtually the same thing to uncomment the parameters of interest, for example:
# sed -i.bak "/DebugLevel/s/^#//" /etc/zabbix/zabbix_agentd.conf
In each case, sed is searching for the label in the first set of forward slashes /.../, next the substitute command is called s and then the expression between the next set of forward slashes, e.g. /^#/ (^ match at the beginning), if matched, is replaced by what follows in the next set // (nothing in the remove comment case).
You will need to adjust the values as required to match each parameter you need to find and replace. Let me know if you have further problems and exactly what the problem is.
I have a file, that has variations of this line multiple times:
source = "git::https://github.com/ORGNAME/REPONAME.git?ref=develop"
I am passing through a tag name in a variable. I want to find every line that starts with source and update that line in the file to be
source = "git::https://github.com/ORGNAME/REPONAME.git?ref=$TAG"
This should be able to be done with awk and sed, but having some difficulty making it work. Any help would be much appreciated!
Best,
Keren
Edit: In this scenario, the it says "develop", but it could also be set to "feature/test1" or "0.0.1" as well.
Edit2: The line with "source" is also indented by three or four spaces.
This should do:
sed 's/^\([[:blank:]]*source.*[?]ref=\)[^"]*\("\)/\1'"$TAG"'\2/' file
with sed
$ sed '/^source/s/ref=develop"$/ref=$TAG"/' file
replace ref=develop" at the end of line with ref=$TAG" for lines starting with source.
I am essentially trying to use sed to remove a few lines within a text document. To clean it up. But I'm not getting it right at all. Missing something and I have no idea what...
#!/bin/bash
items[0]='X-Received:'
items[1]='Path:'
items[2]='NNTP-Posting-Date:'
items[3]='Organization:'
items[4]='MIME-Version:'
items[5]='References:'
items[6]='In-Reply-To:'
items[7]='Message-ID:'
items[8]='Lines:'
items[9]='X-Trace:'
items[10]='X-Complaints-To:'
items[11]='X-DMCA-Complaints-To:'
items[12]='X-Abuse-and-DMCA-Info:'
items[13]='X-Postfilter:'
items[14]='Bytes:'
items[15]='X-Original-Bytes:'
items[16]='Content-Type:'
items[17]='Content-Transfer-Encoding:'
items[18]='Xref:'
for f in "${items[#]}"; do
sed '/${f}/d' "$1"
done
What I am thinking, incorrectly it seems, is that I can setup a for loop to check each item in the array that I want removed from the text file. But it's simply not working. Any idea. Sure this is basic and simple and yet I can't figure it out.
Thanks,
Marek
Much better to create a single sed script, rather than generate 19 small scripts in sequence.
Fortunately, generating a script by joining the array elements is moderately easy in Bash:
regex=$(printf '\|%s' "${items[#]}")
regex=${regex#'\|'}
sed "/^$regex/d" "$1"
(Notice also the addition of ^ to the final regex -- I assume you only want to match at beginning of line.)
Properly, you should not delete any lines from the message body, so the script should leave anything after the first empty line alone:
sed "1,/^\$/!b;/$regex/d" "$1"
Add -i if you want in-place editing of the target file.
i have a template, with a var LINK
and a data file, links.txt, with one url per line
how in bash i can substitute LINK with the content of links.txt?
if i do
#!/bin/bash
LINKS=$(cat links.txt)
sed "s/LINKS/$LINK/g" template.xml
two problem:
$LINKS has the content of links.txt without newline
sed: 1: "s/LINKS/http://test ...": bad flag in substitute command: '/'
sed is not escaping the // in the links.txt file
thanks
Use some better language instead. I'd write a solution for bash + awk... but that's simply too much effort to go into. (See http://www.gnu.org/manual/gawk/gawk.html#Getline_002fVariable_002fFile if you really want to do that)
Just use any language where you don't have to mix control and content text. For example in python:
#!/usr/bin/env python
links = open('links.txt').read()
template = open('template.xml').read()
print template.replace('LINKS', links)
Watch out if you're trying to force sed solution with some other separator - you'll get into the same problems unless you find something disallowed in urls (but are you verifying that?) If you don't, you already have another problem - links can contain < and > and break your xml.
You can do this using ed:
ed template.xml <<EOF
/LINKS/d
.r links.txt
w output.txt
EOF
The first command will go to the line
containing LINKS and delete it.
The second line will insert the
contents of links.txt on the current
line.
The third command will write the file
to output.txt (if you omit output.txt
the edits will be saved to
template.xml).
Try running sed twice. On the first run, replace / with \/. The second run will be the same as what you currently have.
The character following the 's' in the sed command ends up the separator, so you'll want to use a character that is not present in the value of $LINK. For example, you could try a comma:
sed "s,LINKS,${LINK}\n,g" template.xml
Note that I also added a \n to add an additional newline.
Another option is to escape the forward slashes in $LINK, possibly using sed. If you don't have guarantees about the characters in $LINK, this may be safer.