add new awk one-liners

- signed-off-by: trimstray <trimstray@gmail.com>
This commit is contained in:
trimstray 2019-11-26 08:41:03 +01:00
parent b2d6885850
commit 35310ec674

117
README.md
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@ -3685,10 +3685,25 @@ python -m base64 -d <<< "dGhpcyBpcyBlbmNvZGVkCg=="
##### Tool: [awk](http://www.grymoire.com/Unix/Awk.html) ##### Tool: [awk](http://www.grymoire.com/Unix/Awk.html)
###### Remove duplicate entries in a file without sorting ###### Search for matching lines
```bash ```bash
awk '!x[$0]++' filename # egrep foo
awk '/foo/' filename
```
###### Search non matching lines
```bash
# egrep -v foo
awk '!/foo/' filename
```
###### Print matching lines with numbers
```bash
# egrep -n foo
awk '/foo/{print FNR,$0}' filename
``` ```
###### Print the last column ###### Print the last column
@ -3697,6 +3712,55 @@ awk '!x[$0]++' filename
awk '{print $NF}' filename awk '{print $NF}' filename
``` ```
###### Find all the lines longer than 80 characters
```bash
awk 'length($0)>80{print FNR,$0}' filename
```
###### Print only lines of less than 80 characters
```bash
awk 'length < 80 filename
```
###### Print double new lines a file
```bash
awk '1; { print "" }' filename
```
###### Print line numbers
```bash
awk '{ print FNR "\t" $0 }' filename
awk '{ printf("%5d : %s\n", NR, $0) }' filename # in a fancy manner
```
###### Print line numbers for only non-blank lines
```bash
awk 'NF { $0=++a " :" $0 }; { print }' filename
```
###### Print the line and the next two (i=5) lines after the line matching regexp
```bash
awk '/foo/{i=5+1;}{if(i){i--; print;}}' filename
```
###### Print the lines starting at the line matching 'server {' until the line matching '}'
```bash
awk '/server {/,/}/' filename
```
###### Print multiple columns with separators
```bash
awk -F' ' '{print "ip:\t" $2 "\n port:\t" $3' filename
```
###### Remove empty lines ###### Remove empty lines
```bash ```bash
@ -3706,10 +3770,29 @@ awk 'NF > 0' filename
awk NF filename awk NF filename
``` ```
###### Print multiple columns with separators ###### Delete trailing white space (spaces, tabs)
```bash ```bash
awk -F' ' '{print "ip:\t" $2 "\n port:\t" $3' filename awk '{sub(/[ \t]*$/, "");print}' filename
```
###### Delete leading white space
```bash
awk '{sub(/^[ \t]+/, ""); print}' filename
```
###### Remove duplicate consecutive lines
```bash
# uniq
awk 'a !~ $0{print}; {a=$0}' filename
```
###### Remove duplicate entries in a file without sorting
```bash
awk '!x[$0]++' filename
``` ```
###### Exclude multiple columns ###### Exclude multiple columns
@ -3718,6 +3801,18 @@ awk -F' ' '{print "ip:\t" $2 "\n port:\t" $3' filename
awk '{$1=$3=""}1' filename awk '{$1=$3=""}1' filename
``` ```
###### Substitute foo for bar on lines matching regexp
```bash
awk '/regexp/{gsub(/foo/, "bar")};{print}' filename
```
###### Add some characters at the beginning of matching lines
```bash
awk '/regexp/{sub(/^/, "++++"); print;next;}{print}' filename
```
###### Get the last hour of Apache logs ###### Get the last hour of Apache logs
```bash ```bash
@ -3729,7 +3824,7 @@ ___
##### Tool: [sed](http://www.grymoire.com/Unix/Sed.html) ##### Tool: [sed](http://www.grymoire.com/Unix/Sed.html)
###### To print a specific line from a file ###### Print a specific line from a file
```bash ```bash
sed -n 10p /path/to/file sed -n 10p /path/to/file
@ -3790,12 +3885,6 @@ grep -RnisI "pattern" *
fgrep "pattern" * -R fgrep "pattern" * -R
``` ```
###### Remove blank lines from a file and save output to new file
```bash
grep . filename > newfilename
```
###### Show only for multiple patterns ###### Show only for multiple patterns
```bash ```bash
@ -3832,6 +3921,12 @@ grep -- -- filename
grep "\-\-" filename grep "\-\-" filename
``` ```
###### Remove blank lines from a file and save output to new file
```bash
grep . filename > newfilename
```
##### Tool: [perl](https://www.perl.org/) ##### Tool: [perl](https://www.perl.org/)
###### Search and replace (in place) ###### Search and replace (in place)