[bash] How to use paste

NAME
     paste -- merge corresponding or subsequent lines of files

SYNOPSIS
     paste [-s] [-d list] file ...
```

### github
- The file in jupyter notebook format on github is [here](https://github.com/hiroshi0530/wa-src/blob/master/article/library/bash/paste/paste_nb.ipynb).

### google colaboratory
- To run it in google colaboratory [here](https://colab.research.google.com/github/hiroshi0530/wa-src/blob/master/article/library/bash/) paste/paste_nb.ipynb)

### environment
The author's OS is macOS, and the options are different from those of Linux and Unix commands.

If you want to run the command in real life, you need to replace the leading ! and %%bash in the first line.


```python
!sw_vers
```

    ProductName: Mac OS X
    ProductVersion: 10.14.6
    BuildVersion: 18G95



```python
!bash --version
```

    GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin18)
    Copyright (C) 2007 Free Software Foundation, Inc.


## Example usage

Create two files to be combined.


```bash
%%bash
echo -e "a\nb\nc\nd\ne\nf" > temp1.txt
echo -e " 1\n 2\n 3\n 4\n 5\n 6" > temp2.txt
```


```bash
%%bash
paste temp1.txt temp2.txt
```

    a 1
    b 2
    c 3
    d 4
    e 5
    f 6


More than three files can be concatenated.


```bash
%%bash
echo -e "a\nb\nc\nd\ne\nf" > temp3.txt
echo -e " 1\n 2\n 3\n 4\n 5\n 6" > temp4.txt
paste temp1.txt temp2.txt temp3.txt temp4.txt
```

    a 1 a 1
    b 2 b 2
    c 3 c 3
    d 4 d 4
    e 5 e 5
    f 6 f 6


### Typical options
- d : Specifies the combining character. Default is tab.
- s : reverse row and column.


```bash
%%bash
paste -d _ temp1.txt temp2.txt
```

    a_ 1
    b_ 2
    c_ 3
    d_ 4
    e_ 5
    f_ 6



```bash
%%bash
paste -s temp1.txt temp2.txt
```

    a b c d e f
     1 2 3 4 5 6