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add sed and other

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I-Man Ng 2019-04-17 15:57:50 +08:00 committed by GitHub
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README.md
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@ -285,7 +285,6 @@ grep -d skip 'bbo' /path/to/files/*
## Sed ## Sed
[[back to top](#handy-bash-oneliner-commands)] [[back to top](#handy-bash-oneliner-commands)]
##### Remove the 1st line ##### Remove the 1st line
```bash ```bash
sed 1d filename sed 1d filename
@ -316,13 +315,20 @@ sed -E '/^.{5}[^2]/d'
sed -i "/bbo/d" filename sed -i "/bbo/d" filename
``` ```
##### When using variable (e.g. $i), use double quotes " " ##### When using variable (e.g. $i), use double quotes " "
e.g. add >$i to the first line (to make a FASTA file) e.g. add >$i to the first line (to make a bioinformatics FASTA file)
```bash ```bash
sed "1i >$i" sed "1i >$i"
# notice the double quotes! in other examples, you can use a single quote, but here, no way! # notice the double quotes! in other examples, you can use a single quote, but here, no way!
# '1i' means insert to first line # '1i' means insert to first line
``` ```
##### Using environment variable and end-of-line pattern at the same time.
```bash
# Use backslash for end-of-line $ pattern, and double quotes for expressing the variable
sed -e "\$s/\$/\n+--$3-----+/"
```
##### Delete/remove empty lines ##### Delete/remove empty lines
```bash ```bash
@ -349,6 +355,11 @@ sed -i '$ s/.$//' filename
sed -i '1s/^/[/' file sed -i '1s/^/[/' file
``` ```
##### Add string at certain line number (e.g. add 'something' to line 1 and line 3)
```bash
sed -e '1isomething -e '3isomething'
```
##### Add string to end of file (e.g. "]") ##### Add string to end of file (e.g. "]")
```bash ```bash
@ -2044,6 +2055,11 @@ hostnamectl set-hostname "mynode"
## Others ## Others
[[back to top](#handy-bash-oneliner-commands)] [[back to top](#handy-bash-oneliner-commands)]
##### Copy a file to multiple files (e.g copy fileA to file(B-D))
```bash
tee <fileA fileB fileC fileD >/dev/null
```
##### Remove newline / nextline ##### Remove newline / nextline
```bash ```bash