Unix systems tend to favor text files, often consisting of one record per line. Most unix configuration files are text files. Unix systems come with many tools to manipulate such files. Most tools process the file in a stream: read a line, process it, emit the corresponding output; this makes it ...
2
votes
3answers
29 views
Regarding separate a single file into multiple files according to line separation
Currently, I have a plain text file, A, such as
lowest priority
very high significance.
outstanding
very novel
In this file, every line contains a sentence. I want to separate this file into ...
1
vote
2answers
59 views
How do I delete the first n lines of an ascii file using shell commands?
I have multiple files that contain ascii text information in the first 5-10 lines, followed by well-tabulated matrix information. In a shell script, I want to remove these first few lines of text so ...
5
votes
2answers
35 views
Sort fields inline
I'm trying to sort within a line of input over an unknown number of fields:
Input:
ab bc
bc ab
cd ef bc
bc cd ef
cd bc ab
ef ab bc cd gh
Output:
ab bc
ab bc
bc cd ef
bc cd ef
ab cb cd
ab bc cd ...
3
votes
4answers
89 views
concatenate two files without adding a newline
If I nano two files, one of which reads 'this' without me entering a newline, and one of which reads 'is' without me entering a newline, I want to be able to then cat the two files together into ...
1
vote
1answer
50 views
What happens for the last line when using N command with sed
Here is my sed command:
echo -e "AB\nCD\nEF\nGH" | sed 'N; D;'
It prints:
GH
while sed processing input line by line, what happens with the last line? (When after that sed saw End-Of-File)? I ...
2
votes
1answer
49 views
Delete repeated words between brackets inline
Our input looks something like
2012-04-17 [GBPGBP]
2012-04-13 [GBP GBP]
2012-04-13 [GBP]
2012-04-11 [GBPGBP]
2012-04-11 [GBP GBP]
2012-04-10 [GBPGBP]
2012-04-06 [GBP GBP GBP]
2012-04-17 ...
1
vote
1answer
36 views
Multiply certain numbers in a text -file by certain constant
I want an alternative solution to this jQuery hack, tasting a bit reinventing the wheel -- look I am sure I could do this with some one-liner using basic *ix tools. Look much easier and ...
1
vote
2answers
76 views
Is there any simple way to change one line in a lot of files?
I'm trying to use PHP CodeSniffer, and here's the result:
-----------------------------------------------------------------
A TOTAL OF 3008 ERROR(S) AND 380 WARNING(S) WERE FOUND IN 46 FILE(S)
...
3
votes
2answers
111 views
How to skip file in sed if it contains regex?
I currently use the following simplified command to remove trailing whitespace and add a newline at end of file where needed:
find . -type f -exec sed -i -e 's/[ \t]\+\(\r\?\)$/\1/;$a\' {} \+
As ...
1
vote
3answers
77 views
loop to paste specific files in different directories
I some directories that contain a similarly named file eg (*Sample_name*.base.coverage.txt). And I would like to paste all of the *base.coverage.txt files together. I have something written, but its ...
4
votes
1answer
76 views
command like wc but with tee behaviour
I want to backup a database using psql and COPY command. here is my script:
psql "user=${USERNAME} host=${HOSTNAME} dbname=${DBNAME} password=${PASSWORD}" -c \
"COPY (SELECT * FROM tbl) ORDER BY id ...
1
vote
2answers
81 views
How can I delete lines that has an empty first column?
INPUT:
CC2352345|m,safnlasndfmnyxdcvyxcvyxcv |klasjdf |3|lasdjflasdf| |2345567356
CC3543353|asdfasdffghntz |klasjdf |3|lsajdfl | ...
3
votes
3answers
105 views
Longest common substring using grep
I have a huge text file called dictionary.txt with entries like
ABC_SEQ_NUM This represents....
ABC_RANK This represents....
ABC_BSC_ID This represents...
PQR_TA_DATE_AF This ...
2
votes
1answer
78 views
Swap two columns in a CSV using SED
I have a CSV file that contains 10 different fields (, is the deliminator). Example data:
student-id,last,first,hwk1,hwk2,hwk3,exam1,hwk4,hwk5,exam2
pts-avail,,,100,150,100,200,150,100,300
...
3
votes
3answers
86 views
How to insert a line into text document right before line containing some text in bash?
I have a variable say $strToInsert I have a file file.html I wonder how to find last appearence of </head> and insert a new line before line with it and fill it with $strToInsert contents?
...
