Learn AWK tweet by tweet
Joined November 2020
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- Following 1,749
- Followers 671
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23 May 2021
π TIL: ECMAScript / Javascript is influenced by AWK
You're welcome #javascript π€ͺ
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18 May 2021
π You agree, don't you? π
17 May 2021
"In terms of programming languages you get the most bang for the buck by learning AWK."
- Brian Kernighan
podquotes.io/quote/21
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17 May 2021
π€ How to print the first and the last line in a file? π€
awk 'NR==1; END{print}
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7 May 2021
π€ Do you want to write better and portable AWK scripts?
Of course you want π
π‘ GAWK (GNU AWK) supports --lint:
> awk --lint 'and($1,$2)' file.txt
awk: cmd. line:1: warning: `and' is a gawk extension
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Bitsized AWK retweeted
4 May 2021
awk is the coolest tool you donβt know
portal.drewdevault.com/2021/β¦
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4 May 2021
π€ Do you find your scripts with all these $1, $2 etc unreadable? π€
π‘ Try giving them names:
> docker ps | awk 'BEGIN{cont_id=1;image=2;}$image=="postgres"{print $cont_id}'
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30 Apr 2021
π€ Is there an AWK script you don't understand? Post it here β¬οΈ
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28 Apr 2021
π While AWK does support if statements, patterns are often easier π‘
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26 Apr 2021
π€ New week new trick! π€
π€ Replace a string in AWK:
> awk '{gsub("bob", "anna")}1' file.txt
β‘οΈ replace "bob" with "anna"
β‘οΈ 1st param can be a regex (eg. /bob/)
β‘οΈ 3rd param is optional (default $0 / line)
π‘sed might be more suitable for such tasks π
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23 Apr 2021
How to print only odd lines π€
24 Dec 2020
> awk 'NR%2 {print $1}' file.txt
anna
chad
π¨βπ¨ This prints odd lines, because %2 (modulo 2) returns 0 if the NR is divisible by 2. Since 0 is false, those lines are not printed.
β‘οΈ The block is easy: just print the first column
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21 Apr 2021
A third of the participants has known AWK for more than ten years π€―
20 Apr 2021
20 Apr 2021
17%
< 1 year
33%
< 5 years
11%
< 10 years
39%
>= 10 years
36 votes β’ Final results
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13 Apr 2021
π€ Did you know you can write a self-contained AWK script? π€
β‘οΈ Given a file:
> cat script.awk
#!/usr/bin/awk -f
{ print $0 }
β‘οΈ Make it executable
> chmod x script.awk
β‘οΈ And run it
> ./script.awk file.txt
π§ If only everything was so easy #Linux π§
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8 Apr 2021
π Last July, @lexfridman interviewed Brian Kernighan, one of the authors of AWK. Listen to Brian explaining why AWK is still very useful today.
youtube.com/watch?v=W5kr7X7Eβ¦
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5 Apr 2021
π€ How to print the container id of a running postgres docker container? π€
> docker ps | awk '/postgres/{print $1}'
π Easy, right?
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1 Apr 2021
π How to print all columns but the first? π
> awk '{$1="";$0=$0} NF=NF' file.txt
π‘ Change to $1=$2="" to omit the second column as well
π‘ The $0=$0 and NF=NF gymnastic is needed to make AWK recalculate what to print. If you don't do it, you might see leading spaces π
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29 Mar 2021
π€ Did you ever pipe grep into AWK? π€
> grep x file.txt | awk '{print $1}'
π‘ No need to grep first, AWK can do it:
> awk '/x/{print $1}' file.txt
β‘οΈ Before the command ({..}) is the pattern. The pattern can be a regex (between slashes) and matches on anything in the line
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Bitsized AWK retweeted
12 Feb 2021
π§βπ How to copy/paste CSV (or other data) into a google spreadsheet? π§βπ
> awk -F';' 'BEGIN{OFS="\t"} $1=$1' file.txt | xclip -sel clip
β‘οΈ Make the data tab-separated and put it into the clipboard
β‘οΈ Now you can use Ctrl-V in a spreadsheet
#Linux #AWK #codingisfun
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19 Mar 2021
π€ Another popular AWK question from StackOverflow: How to print all lines starting from the n-th? π€
> awk 'NR>=2' file.txt
π‘ remember that the first line has NR=1 β‘οΈ the above prints from the 2nd line onwards
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