I have a file in the format:
C 1 1 2
H 2 2 1
C 3 1 2
C 3 3 2
H 2 3 1
I need to add " f" to the end of specific lines, for example the third line, so the output would be:
C 1 1 2
H 2 2 1
C 3 1 2 f
C 3 3 2
H 2 3 1
From Googling, it seems that I need to use sed, but I couldn't find any examples on how to do specifically what I want.
Thanks in advance.
You are looking for this article on sed. Specifically, the section on restricting to a line number. An example:
sed '3 s/$/f/' < yourFile
awk 'NR==3{$0=$0" f"}1' your_file
Related
I have a file of the like:
H 1 2 3 4
H 1 2 3 4
C 1 2 3 4
$END
$EFRAG
COORD=CART
FRAGNAME=H2ODFT
O 1 2 3 4
H 1 2 3 4
H 1 2 3 4
FRAGNAME=H2ODFT
O 1 2 3 4
H 1 2 3 4
H 1 2 3 4
I want to remove the column "1" from the lines only after the $EFRAG line. and add a label to the O H H as well. My expected output is:
H 1 2 3 4
H 1 2 3 4
C 1 2 3 4
$END
$EFRAG
COORD=CART
FRAGNAME=H2ODFT
Oa 2 3 4
Hb 2 3 4
Hc 2 3 4
FRAGNAME=H2ODFT
Oa 2 3 4
Hb 2 3 4
Hc 2 3 4
I'm new to coding in bash, and I'm not quite sure where to start.
I was thinking of piping a grep command to a sed command, but I'm not sure how that syntax would look. Am also trying to learn awk, but that syntax is even more confusing to me. Currently trying to read a book on it's capabilities.
Any thoughts or ideas would be greatly appreciated!
L
Use the following awk processing:
awk '$0~/\$EFRAG/ {
start = 1; # marker denoting the needed block
split("a b c", suf); # auxiliary array of suffixes
}
start {
if (/^FRAGNAME/) idx = 1; # encountering subblock
if (/^[OH]/) { # if starting with O or H char
$2 = "";
$1 = $1 suf[idx++];
}
}1' test.txt
H 1 2 3 4
H 1 2 3 4
C 1 2 3 4
$END
$EFRAG
COORD=CART
FRAGNAME=H2ODFT
Oa 2 3 4
Hb 2 3 4
Hc 2 3 4
FRAGNAME=H2ODFT
Oa 2 3 4
Hb 2 3 4
Hc 2 3 4
If ed is available/acceptable.
The script.ed (name it to your own hearts content) something like:
/\$EFRAG$/;$g/^O /s/^\([^ ]*\) [^ ]* \(.*\)$/\1a \2/\
/^H /s/^\([^ ]*\) [^ ]* \(.*\)$/\1b \2/\
/^H /s/^\([^ ]*\) [^ ]* \(.*\)$/\1c \2/
,p
Q
Now run
ed -s file.txt < script.ed
Change Q to w if in-place editing is required.
Remove the ,p to silence the output.
This might work for you (GNU sed):
sed -E '1,/\$EFRAG/b;/^O/{N;N;s/^(O) \S+(.*\nH) \S+(.*\nH) \S+/\1a\2b\3c/}' file
Do not process lines from the start of the file until after encountering one containing $EFRAG.
If a line begins O, append the next two lines and then using pattern matching and back references, format those lines accordingly.
cat file1.txt
set A B 1
set C D E 2
set E F 3 3 3 3 3 3
cat file2.txt
A;B;1;
C;D.E;2;
E;F;3 3 3 3 3 3;
please help convert the format in file1.txt to file2.txt, the file2.txt is the output. I just input 3 lines in file1.txt for taking example, but in fact ,there are many command lines same with these 3 format.So the shell command should be adapt to any situation where the content contains these 3 format in file1.txt.
echo "set A B 1
set C D E 2
set E F 3 3 3 3 3 3 " | sed -r 's/set (.) /\1;/;s/([A-Z])*( ([A-Z]))/\1.\3/g;s/([A-Z]) ([0-9])/\1;\2/;s/ ?$/;/'
A;B;1;
C;D.E;2;
E;F;3 3 3 3 3 3;
Given I have a python script as follows:
#!/usr/bin/python
for i in range(1,4):
print i
I want to run it in a bash loop for 3 times but I want to add the output as columns rather than concatenating. Is there a way to achieve this?
Output:
1 1 1
2 2 2
3 3 3
Like this?:
$ for i in {1..3} ; do echo $i $i $i ; done
1 1 1
2 2 2
3 3 3
You are looking for the pr command:
for i in 1 2 3 ; do
python a.py
done | pr -t -3
Output:
1 1 1
2 2 2
3 3 3
Btw, to get the numbers from 1 to 3 you need to use:
range(1,4) # <-- 4, not 3!
in Python
Main file:
A B
C D
D A
G H
Ref file:
1 A
2 B
3 C
4 D
5 G
6 H
New file:
1 2
3 4
4 1
5 6
I wanna do the above replacement, how can I do that using awk or some simple command line?
awk solution:
awk 'NR==FNR{ a[$2]=$1; next }{ $1=a[$1]; $2=a[$2] }1' reffile mainfile
The output:
1 2
3 4
4 1
5 6
a[$2]=$1 - capturing numbers from reffile into array indexed by letters (e.g. a["A"]=1)
$1=a[$1]; $2=a[$2] - replacing letters in mainfile with respective numbers
I have created a sorted list of hashes for certain files
ffb01af8fda1e5c3b74d1eb384d021be1f1577c3 *./Pictures/camera/London 170713/P9110042.JPG
ffb01af8fda1e5c3b74d1eb384d021be1f1577c3 *./Pictures/london/P9110042.JPG
where there are duplicate hashes (just the hashes), I want to print the whole line of all matches
so say there where hashes A B C
A 1
B 2
B 3
C 4
C 5
C 6
in this example all the lines except the first one should be printed
B 2
B 3
C 4
C 5
C 6
Before you continue, look up fdupes.
If you don't want to use a robust tool specifically intended to find duplicate files, you can use sort | uniq:
$ cat file
A 1
B 2
B 3
C 4
C 5
C 6
$ sort file | uniq -w 1 -D
B 2
B 3
C 4
C 5
C 6
Using awk you can do (will work with unsorted file also):
awk 'FNR==NR{seen[$1]++; next} seen[$1]>1' file file
B 2
B 3
C 4
C 5
C 6