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I am making a sincere effort to master bash.
What would a line like below mean ?
ps -ef | awk '/ora_pmon_/ && !/awk/'
Thank you.
This means as follows.
ps -ef | awk '/ora_pmon_/ && !/awk/'
You are first getting the output of ps -ef which will have information of all processes running. Then by using a <pipe> (|) we send this output to the standard input of the awk command.
awk will check for lines, basically process names, having the string ora_pmon in them AND NOT the string awk. The latter is to exclude the process of this command which we do not want in output.
The correct way to do what you want though is just:
ps -ef | awk '/[o]ra_pmon_/'
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Is there a way to use the 'ls' command then then pipe the output to only show the unique item?
Here is the example:
ls /dev/disk/by-id
ata-ST500DM002-1BD142_S2AFE0JP
ata-ST500DM002-1BD142_W2AEDMQK
ata-ST500DM002-1BD142_W2AEDMQK-part1
ata-ST500DM002-1BD142_W2AEDMQK-part2
ata-ST500DM002-1BD142_W2AEDMQK-part3
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EEV65804
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EEV65804-part1
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EEV65804-part9
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EKK60289
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EKK60289-part1
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EKK60289-part9
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2ET092491
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2ET092491-part1
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2ET092491-part9
ata-WDC_WD5003AZEX-00MK2A0_WD-WCC3F2HAD1XC
ata-WDC_WD5003AZEX-00MK2A0_WD-WCC3F2HAD1XC-part1
ata-WDC_WD5003AZEX-00MK2A0_WD-WCC3F2HAD1XC-part9
As you can see in the output all but one of the items has the serial number and a -part# to it, but the serial ontop:
'ata-ST500DM002-1BD142_S2AFE0JP'
Does not. What I am trying to do is get the output to only show me the resits that do not have any other duplicate serial entries.The out out would be just the unique serial number.
ata-ST500DM002-1BD142_S2AFE0JP
Thank you.
Assuming these entries don't contain newlines, you may use:
printf '%s\n' /dev/disk/by-id/* |
awk '!/-part[0-9]*$/{arr[$0]; next} { sub(/-[^-]+$/, ""); delete arr[$0] }
END { for (i in arr) print i }'
ata-ST500DM002-1BD142_S2AFE0JP
Use grep with a regular expression : ls | grep -Ev 'part.*$'
$ ls test
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EEV65804 ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EEV65804-part9 ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2ET092491-part1
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EEV65804-part1 ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2ET092491 ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2ET092491-part9
$ ls test | grep -Ev 'part.*$'
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2EEV65804
ata-WDC_WD5000AAKX-60U6AA0_WD-WCC2ET092491
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I have an output from a program that I would like to process and If I pipe it to a file I get:
file/path#backup2018
file2/path/more/path/path#backup2019
file3/path#backup2017
And I want to process it so it looks like this:
file/path file.path
file2/path/more/path/path file.path.more.path.path
file3/path file.path
I have figured out how to make it with separate commands but would like a one liner.
$ awk -F# '{s=$1; gsub("/", ".", s); print $1, s}' file | column -t
file/path file.path
file2/path/more/path/path file2.path.more.path.path
file3/path file3.path
using sed
sed 's/\([^#]*\)#.*/\1 \1/g' file|column -t
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I have a text file containing a few string values:
PIZZA_123
CHEESE_PIZZA_785
CHEESE_PANEER_PIZZA_256
I need to remove the numeric values in these values and need the following output. The tricky part for me is that these numeric values are random every time. I need to remove these numeric values and write the string values alone to a file.
CHEESE_PIZZA
CHEESE_PANEER_PIZZA
What is an easy way to do this?
sed 's/_[0-9]*$//' file > file2
Will do it.
There's more than one way to do it. For example, since the numbers always seem to be in the last field, we can just cut off the last field with a little help from the rev util. Suppose the input is pizza.txt:
rev pizza.txt | cut -d _ -f 2- | rev
Since this uses two utils and two pipes, it's not more efficient than sed. The sole advantage for students is that regex isn't necessary -- the only text needed is the _ as a field separator.
You can use the below script for this.
#!/bin/bash
V1=PIZZA_123
V2=CHEESE_PIZZA_785
V3=CHEESE_PANEER_PIZZA_256
IFS=0123456789
echo $V1>tem.txt
echo $V2>>tem.txt
echo $V3>>tem.txt
echo "here are the values:"
sed 's/...$//' tem.txt
rm -rf tem.txt
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I suspect I am going around this the long way but please bear with me I am new to Bash, grep and awk ...
The summary of my problem is that line numbers in grep do no correspond to the actual line numbers in a file. From what I gather empty lines are discarded in the line numbering. I would prefer not to iterate through every line in a file to ensure 100% coverage.
What I am trying to do is grab a segment of lines from a file and process them using grep and awk
The grep call gets a list of line numbers since there could be more than one instance of a 'starting position' in a file:
startLnPOSs=($(cat "$c"| grep -e '^[^#]' | grep --label=root -e '^[[:space:]]start-pattern' -n -T | awk '{print $1}'
Then using awk I iterate from a starting point until an 'end' token is encountered.
declarations=($(cat "$c" | awk "$startLnPos;/end-pattern/{exit}" ))
To me this looks a bit like an xy problem as you are showing us what you are doing to solve a problem but not actually outlining the problem.
So on a guess I am thinking you want to return all the items between the start/end patterns to your array (which may also be erroneous, but again we do not know the overall picture).
So what you could do is:
declarations=($(awk '/start-pattern/,/end-pattern/' "$c"))
Or with sed (exactly the same):
declarations=($(sed -n '/start-pattern/,/end-pattern/p' "$c"))
Depending if you want those actual lines included or not the commands may need to be altered a little.
Was this the kind of thing you were looking to do??
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I am tailing the logs to find if there is any Exception as show below
tail -f flexi.log | grep "Exception" --color
This works fine , but unfortanely i dont want to log it incase if there s any DataNotAvailableException .
The DataNotAvailableException comes frequently and i dont want to log that .
Is this possible ??
Just add another grep to search and remove the DataNotAvailables.
tail -f flexi.log | grep "Exception" --color | grep -v "DataNotAvailableException"