Good day,
Im trying to create an alias using awk to filter based on a column which has number greater than a set limit. Its ok when used as a command line but when I assign it as an alias, it prompts error.
$ grep "SoftBin 108" wmap*CP1 wmap_01_CP1:DISP_OB: SoftBin 108 is 19 dice exceeded Bin Reject Control limit of 7 dice wmap_02_CP1:DISP_OB: SoftBin 108 is 13 dice exceeded Bin Reject Control limit of 7 dice wmap_03_CP1:DISP_OB: SoftBin 108 is 11 dice exceeded Bin Reject Control limit of 7 dice wmap_04_CP1:DISP_OB: SoftBin 108 is 20 dice exceeded Bin Reject Control limit of 7 dice wmap_05_CP1:DISP_OB: SoftBin 108 is 7 dice exceeded Bin Reject Control limit of 7 dice wmap_06_CP1:DISP_OB: SoftBin 108 is 14 dice exceeded Bin Reject Control limit of 7 dice wmap_07_CP1:DISP_OB: SoftBin 108 is 14 dice exceeded Bin Reject Control limit of 7 dice wmap_08_CP1:DISP_OB: SoftBin 108 is 18 dice exceeded Bin Reject Control limit of 7 dice $ grep "SoftBin 108" wmap*CP1 | awk '$5>15' wmap_01_CP1:DISP_OB: SoftBin 108 is 19 dice exceeded Bin Reject Control limit of 7 dice wmap_04_CP1:DISP_OB: SoftBin 108 is 20 dice exceeded Bin Reject Control limit of 7 dice wmap_08_CP1:DISP_OB: SoftBin 108 is 18 dice exceeded Bin Reject Control limit of 7 dice
$5 is column 5 on the grep output while 15 is the set limit. When I set the alias command, it threw
read only file system for any limit i set. I tried changing single qoute using double qoute but then it prompted a different issue.
$ alias SB108='grep "SoftBin 108" wmap*CP1 | awk '$5>15'' -bash: 15: Read-only file system $ alias SB108="grep "SoftBin 108" wmap*CP1 | awk '$5>15'" -bash: alias: 108 wmap*CP1 | awk '>15': not found
Ive seen some similar cases in the forum which suggest using function instead but im not familiar with that. I tried doing it but another error was prompted.
$ SB108(){grep "SoftBin 108" wmap*CP1 | awk '$5>15';}
-bash: syntax error near unexpected token `('
Appreciate the help on this issue of mine. Thanks a lot in advance.
regards, Mike
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Answer
Here is one way to achieve your goal
[akshay@c1 tmp]$ tail -5 ~/.bashrc
test_awk() {
grep "SoftBin 108" "$@" | awk '$5>15'
}
export -f test_awk
# source it or logout and login back
[akshay@c1 tmp]$ source ~/.bashrc
Please note The export -f feature is specific to Bash Refer Export Man Page
You don’t have to use grep, single awk can do your job, like below
awk '/SoftBin 108/ && $5>15' "$@"
Test below one
[akshay@gold tmp]$ awk '/SoftBin 108/ && $5>15' wmap* wmap_01_CP1:DISP_OB: SoftBin 108 is 19 dice exceeded Bin Reject Control limit of 7 dice wmap_04_CP1:DISP_OB: SoftBin 108 is 20 dice exceeded Bin Reject Control limit of 7 dice wmap_08_CP1:DISP_OB: SoftBin 108 is 18 dice exceeded Bin Reject Control limit of 7 dice
your sample file for testing
[akshay@c1 tmp]$ cat >wmap_12345_CP1<<EOF > wmap_01_CP1:DISP_OB: SoftBin 108 is 19 dice exceeded Bin Reject Control limit of 7 dice > wmap_02_CP1:DISP_OB: SoftBin 108 is 13 dice exceeded Bin Reject Control limit of 7 dice > wmap_03_CP1:DISP_OB: SoftBin 108 is 11 dice exceeded Bin Reject Control limit of 7 dice > wmap_04_CP1:DISP_OB: SoftBin 108 is 20 dice exceeded Bin Reject Control limit of 7 dice > wmap_05_CP1:DISP_OB: SoftBin 108 is 7 dice exceeded Bin Reject Control limit of 7 dice > wmap_06_CP1:DISP_OB: SoftBin 108 is 14 dice exceeded Bin Reject Control limit of 7 dice > wmap_07_CP1:DISP_OB: SoftBin 108 is 14 dice exceeded Bin Reject Control limit of 7 dice > wmap_08_CP1:DISP_OB: SoftBin 108 is 18 dice exceeded Bin Reject Control limit of 7 dice > EOF
call
[akshay@c1 tmp]$ test_awk wmap* wmap_01_CP1:DISP_OB: SoftBin 108 is 19 dice exceeded Bin Reject Control limit of 7 dice wmap_04_CP1:DISP_OB: SoftBin 108 is 20 dice exceeded Bin Reject Control limit of 7 dice wmap_08_CP1:DISP_OB: SoftBin 108 is 18 dice exceeded Bin Reject Control limit of 7 dice [akshay@c1 tmp]$ echo $BASH_VERSION 4.1.2(1)-release