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.
Related
I need to replace a particular line with a new-text-string ,tried few things but not succeeded.
This is what I did:
1- Get the line number which needs to be replaced using
lineNum=$(sed -n '/Old-Line-Text/=' FileName.txt);
2- Use the Line number from step 1 to replace that line using
sed 'Ns/.*/New-Line-Text/' FileName.txt > FileName2.txt;
Now I need to combine these two commands in one commands. Tried certain things But was't able to get it Fixed.
Better do this :
sed '/Old-Line-Text/s/.*/New-Line-Text/' file
but this can be resumed as just :
sed 's/.*Old-Line-Text.*/New-Line-Text/' file
I have a file, that has variations of this line multiple times:
source = "git::https://github.com/ORGNAME/REPONAME.git?ref=develop"
I am passing through a tag name in a variable. I want to find every line that starts with source and update that line in the file to be
source = "git::https://github.com/ORGNAME/REPONAME.git?ref=$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=$TAG" for lines starting with source.
I have a list of lines in variable (1,3,8,9). That list shows which lines I need to delete from a text file. which function I can use to delete specific lines number?
Thank you so much for your respond
# set -vx
lines2del="(1,3,8,9)"
sedCmds=${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
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" "$1"
Add -i if you want in-place editing of the target file.
I've researched other questions on here, but haven't really found one that works for me. I'm trying to select a specific line from a file and replace a string on that line with another string. So I have a file named my_course. I'm trying to modify a line in my_course that starts with "123". on that line I want to replace the string "0," with "1,". Help?
One possibility would be to use sed:
sed '/^123/ s/0/1/' my_course
In the first /../ part you just have to specify the pattern you are looking for ^123 for a line starting with 123.
In the s/from/to/ part you have specify the substitution to be performed.
Note that by default after substitution the file will be written to stdout. You might want to:
redirect the output using ... > my_new_course
perform the substitution "in place" using the -e switch to sed
If you are using the destructive in place variant you might want to use -iEXTENSION in addition to keep a copy with the given EXTENSION of the original version in case something goes wrong.
EDIT:
To match the desired lined with a prefix stored in a variable you have to enclose the sed script with double quotes " as using single qoutes ' will prevent variable expansion:
sed "/^$input/ s/0/1/" my_course
Have you tried this:
sed -e '[line]s/old_string/new_string/' my_course
PS: the [ ] shouldn't be used, is there just to make it clear that you should put the number right before the "s".
Cheers!
In fact, the -e in this case is not necessary, I can write just
sed '<line number>s/<old string>/<new string>/' my_course
This is what worked for me on Fedora 36, GNU bash, version 5.2.15(1)-release (x86_64-redhat-linux-gnu):
sed -i '1129s/additional/extra/' en-US/Design.xml
I know you said you couldn't use line numbers; I don't know how to address that part, but this replaced "additional" with "extra" on line 1129 of that file.