what is awk '{print $1+0.45 “ ” $2 “ ” $3 }' file1> file2?
What does awk '{print $1+0.45 " " $2 " " $3 }' positionXYZ > positionX0.45YZ
mean? Does it mean changing a row in the first file and put the new data into the second one?
awk
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
asked Jan 29 '14 at 21:49
MevaMeva
1032310
add a comment |
What does awk '{print $1+0.45 " " $2 " " $3 }' positionXYZ > positionX0.45YZ
mean? Does it mean changing a row in the first file and put the new data into the second one?
awk
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
asked Jan 29 '14 at 21:49
MevaMeva
1032310
add a comment |
What does awk '{print $1+0.45 " " $2 " " $3 }' positionXYZ > positionX0.45YZ
mean? Does it mean changing a row in the first file and put the new data into the second one?
awk
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
asked Jan 29 '14 at 21:49
MevaMeva
1032310
What does awk '{print $1+0.45 " " $2 " " $3 }' positionXYZ > positionX0.45YZ
mean? Does it mean changing a row in the first file and put the new data into the second one?
awk
awk
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
asked Jan 29 '14 at 21:49
MevaMeva
1032310
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
asked Jan 29 '14 at 21:49
MevaMeva
1032310
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
edited Jan 29 '14 at 23:58
Gilles
539k12810911606
539k12810911606
asked Jan 29 '14 at 21:49
MevaMeva
1032310
asked Jan 29 '14 at 21:49
MevaMeva
1032310
asked Jan 29 '14 at 21:49
MevaMeva
1032310
1032310
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
Let's break this down. awk '{foo}' file will apply the expression foo to each line of file and print the result to the terminal (standard output). awk splits its input lines on white space (by default) and saves each field as $1, $2 etc.
So, the actual expression you are running means: read each input line, add 0.45 to the value of the first field and then print that field as well as the second and third one. This is most easily explained with a simple example:
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt
10.45 20 30
50.45 60 70
So, as you can see, the awk script added 0.45 to the first field of each line and then printed it along with the second and third. The fourth was ignored since you did not tell it to print $4.
The next bit has nothing to do with awk, the > symbol is for output redirection and is used by the shell (bash or zsh or whatever you are using). In general command > file will save the output of command in the file file overwriting the contents of the file if it exists and creating it if it does not.
Putting everything together:
$ ls
file.txt
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt > file2.txt
$ ls
file2.txt file.txt
$ cat file2.txt
10.45 20 30
50.45 60 70
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
add a comment |
file2 has 0.45 added to each value of first column (the x'es), column 2 and 3 are copied as is, anything else on the line is ignored.
awk reads each line of file1 and runs the script between {}
The script is run on every line, white spaced delimitered fields are assigned to positional parameters $1, $2 $3, ...
The parameters are printed except $1 is added with 0.45
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
add a comment |
$1, $2, $3 mean placeholders of value got at the previous operation.
answered 33 mins ago
imissyouimissyou
1
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
Let's break this down. awk '{foo}' file will apply the expression foo to each line of file and print the result to the terminal (standard output). awk splits its input lines on white space (by default) and saves each field as $1, $2 etc.
So, the actual expression you are running means: read each input line, add 0.45 to the value of the first field and then print that field as well as the second and third one. This is most easily explained with a simple example:
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt
10.45 20 30
50.45 60 70
So, as you can see, the awk script added 0.45 to the first field of each line and then printed it along with the second and third. The fourth was ignored since you did not tell it to print $4.
The next bit has nothing to do with awk, the > symbol is for output redirection and is used by the shell (bash or zsh or whatever you are using). In general command > file will save the output of command in the file file overwriting the contents of the file if it exists and creating it if it does not.
Putting everything together:
$ ls
file.txt
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt > file2.txt
$ ls
file2.txt file.txt
$ cat file2.txt
10.45 20 30
50.45 60 70
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
add a comment |
Let's break this down. awk '{foo}' file will apply the expression foo to each line of file and print the result to the terminal (standard output). awk splits its input lines on white space (by default) and saves each field as $1, $2 etc.
So, the actual expression you are running means: read each input line, add 0.45 to the value of the first field and then print that field as well as the second and third one. This is most easily explained with a simple example:
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt
10.45 20 30
50.45 60 70
So, as you can see, the awk script added 0.45 to the first field of each line and then printed it along with the second and third. The fourth was ignored since you did not tell it to print $4.
The next bit has nothing to do with awk, the > symbol is for output redirection and is used by the shell (bash or zsh or whatever you are using). In general command > file will save the output of command in the file file overwriting the contents of the file if it exists and creating it if it does not.
Putting everything together:
$ ls
file.txt
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt > file2.txt
$ ls
file2.txt file.txt
$ cat file2.txt
10.45 20 30
50.45 60 70
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
add a comment |
Let's break this down. awk '{foo}' file will apply the expression foo to each line of file and print the result to the terminal (standard output). awk splits its input lines on white space (by default) and saves each field as $1, $2 etc.
So, the actual expression you are running means: read each input line, add 0.45 to the value of the first field and then print that field as well as the second and third one. This is most easily explained with a simple example:
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt
10.45 20 30
50.45 60 70
So, as you can see, the awk script added 0.45 to the first field of each line and then printed it along with the second and third. The fourth was ignored since you did not tell it to print $4.
The next bit has nothing to do with awk, the > symbol is for output redirection and is used by the shell (bash or zsh or whatever you are using). In general command > file will save the output of command in the file file overwriting the contents of the file if it exists and creating it if it does not.
Putting everything together:
$ ls
file.txt
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt > file2.txt
$ ls
file2.txt file.txt
$ cat file2.txt
10.45 20 30
50.45 60 70
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
Let's break this down. awk '{foo}' file will apply the expression foo to each line of file and print the result to the terminal (standard output). awk splits its input lines on white space (by default) and saves each field as $1, $2 etc.
So, the actual expression you are running means: read each input line, add 0.45 to the value of the first field and then print that field as well as the second and third one. This is most easily explained with a simple example:
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt
10.45 20 30
50.45 60 70
So, as you can see, the awk script added 0.45 to the first field of each line and then printed it along with the second and third. The fourth was ignored since you did not tell it to print $4.
The next bit has nothing to do with awk, the > symbol is for output redirection and is used by the shell (bash or zsh or whatever you are using). In general command > file will save the output of command in the file file overwriting the contents of the file if it exists and creating it if it does not.
Putting everything together:
$ ls
file.txt
$ cat file.txt
10 20 30 40
50 60 70 80
$ awk '{print $1+0.45 " " $2 " " $3 }' file.txt > file2.txt
$ ls
file2.txt file.txt
$ cat file2.txt
10.45 20 30
50.45 60 70
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
answered Jan 29 '14 at 21:58
terdon♦terdon
131k32258436
131k32258436
add a comment |
add a comment |
file2 has 0.45 added to each value of first column (the x'es), column 2 and 3 are copied as is, anything else on the line is ignored.
awk reads each line of file1 and runs the script between {}
The script is run on every line, white spaced delimitered fields are assigned to positional parameters $1, $2 $3, ...
The parameters are printed except $1 is added with 0.45
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
add a comment |
file2 has 0.45 added to each value of first column (the x'es), column 2 and 3 are copied as is, anything else on the line is ignored.
awk reads each line of file1 and runs the script between {}
The script is run on every line, white spaced delimitered fields are assigned to positional parameters $1, $2 $3, ...
The parameters are printed except $1 is added with 0.45
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
add a comment |
file2 has 0.45 added to each value of first column (the x'es), column 2 and 3 are copied as is, anything else on the line is ignored.
awk reads each line of file1 and runs the script between {}
The script is run on every line, white spaced delimitered fields are assigned to positional parameters $1, $2 $3, ...
The parameters are printed except $1 is added with 0.45
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
file2 has 0.45 added to each value of first column (the x'es), column 2 and 3 are copied as is, anything else on the line is ignored.
awk reads each line of file1 and runs the script between {}
The script is run on every line, white spaced delimitered fields are assigned to positional parameters $1, $2 $3, ...
The parameters are printed except $1 is added with 0.45
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
edited Jan 29 '14 at 22:05
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
answered Jan 29 '14 at 21:58
X TianX Tian
7,72712136
7,72712136
add a comment |
add a comment |
$1, $2, $3 mean placeholders of value got at the previous operation.
answered 33 mins ago
imissyouimissyou
1
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
$1, $2, $3 mean placeholders of value got at the previous operation.
answered 33 mins ago
imissyouimissyou
1
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
$1, $2, $3 mean placeholders of value got at the previous operation.
answered 33 mins ago
imissyouimissyou
1
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$1, $2, $3 mean placeholders of value got at the previous operation.
answered 33 mins ago
imissyouimissyou
1
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 33 mins ago
imissyouimissyou
1
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 33 mins ago
imissyouimissyou
1
answered 33 mins ago
imissyouimissyou
1
1
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
imissyou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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