I'm attempting to write output from ps into two comma-separated columns with custom headers which I can write to a csv file. The target format looks like:
Process ID,Command name
282,sort
280,ps
284,head
136,bash
283,awk
281,awk
Here's the command I've composed so far:
ps -o pid="Process ID" -o comm="Command name" | (read -r; printf "%s\n" "$REPLY"; sort -k2 -r)
which produces the following output:
Process ID Command name
23104 sort
24756 ps
24757 bash
19320 bash
23103 awk
I need to replace the whitespace characters in each line (except the first, which needs special processing) with commas. Is there a way to do said replacement in the printf command? Or am I approaching this wrong?
ps -o pid,comm --no-headers | awk 'BEGIN{print "Process ID,Command name"}{$1=$1}1' OFS=,
You can use the printf read combo. However, in your code, the printf prints only the first line read by read. The rest is printed by sort. while loop is your friend here:
printf 'Process ID,Command name\n'
while read -r id cmd; do
printf '%s,%s\n' "$id" "$cmd"
done < <(ps -o pid,comm --no-headers)
And to have the output of ps sorted, pipe it to sort like you did, or use the --sort option:
ps -o pid,comm --no-headers --sort -comm
Related
kubectl get nodes -o name gives me the output
node/k8s-control.anything
node/k8s-worker1.anything
I need to get only
control
worker1
as output and want to iterate through these elements
for elm in $(kubectl get nodes -o name); do echo "$elm" >> file.txt; done
So the question is how to get the string between node/k8s- and .anything and iterate these in the for loop.
You can for example use cut twice, first to get a part after - and
then to get a part before .:
for elm in $(kubectl get nodes -o name | cut -d- -f2 | cut -d. -f1); do echo "$elm" >> file.txt; done
With awk
kubectl get nodes -o name | awk -F'[.-]' '{print $2}' > file.txt
You can use grep with -oP filter to extract the desired substring. Later, you can use > operator to redirect to the file.txt.
kubectl get nodes -o name|grep -oP 'node.*?-\K[^.]+'
control
worker1
Another option might be bash parameter expansion:
while read -r line ; do line="${line#*-}"; line="${line%.*}"; printf "%s\n" "$line" ; done < <(kubectl get nodes -o name)
I have a log file with a lot of lines with the following format:
IP - - [Timestamp Zone] 'Command Weblink Format' - size
I want to write a script.sh that gives me the number of times each website has been clicked.
The command:
awk '{print $7}' server.log | sort -u
should give me a list which puts each unique weblink in a separate line. The command
grep 'Weblink1' server.log | wc -l
should give me the number of times the Weblink1 has been clicked. I want a command that converts each line created by the Awk command above to a variable and then create a loop that runs the grep command on the extracted weblink. I could use
while IFS='' read -r line || [[ -n "$line" ]]; do
echo "Text read from file: $line"
done
(source: Read a file line by line assigning the value to a variable) but I don't want to save the output of the Awk script in a .txt file.
My guess would be:
while IFS='' read -r line || [[ -n "$line" ]]; do
grep '$line' server.log | wc -l | ='$variabel' |
echo " $line was clicked $variable times "
done
But I'm not really familiar with connecting commands in a loop, as this is my first time. Would this loop work and how do I connect my loop and the Awk script?
Shell commands in a loop connect the same way they do without a loop, and you aren't very close. But yes, this can be done in a loop if you want the horribly inefficient way for some reason such as a learning experience:
awk '{print $7}' server.log |
sort -u |
while IFS= read -r line; do
n=$(grep -c "$line" server.log)
echo "$line" clicked $n times
done
# you only need the read || [ -n ] idiom if the input can end with an
# unterminated partial line (is illformed); awk print output can't.
# you don't really need the IFS= and -r because the data here is URLs
# which cannot contain whitespace and shouldn't contain backslash,
# but I left them in as good-habit-forming.
# in general variable expansions should be doublequoted
# to prevent wordsplitting and/or globbing, although in this case
# $line is a URL which cannot contain whitespace and practically
# cannot be a glob. $n is a number and definitely safe.
# grep -c does the count so you don't need wc -l
or more simply
awk '{print $7}' server.log |
sort -u |
while IFS= read -r line; do
echo "$line" clicked $(grep -c "$line" server.log) times
done
However if you just want the correct results, it is much more efficient and somewhat simpler to do it in one pass in awk:
awk '{n[$7]++}
END{for(i in n){
print i,"clicked",n[i],"times"}}' |
sort
# or GNU awk 4+ can do the sort itself, see the doc:
awk '{n[$7]++}
END{PROCINFO["sorted_in"]="#ind_str_asc";
for(i in n){
print i,"clicked",n[i],"times"}}'
The associative array n collects the values from the seventh field as keys, and on each line, the value for the extracted key is incremented. Thus, at the end, the keys in n are all the URLs in the file, and the value for each is the number of times it occurred.
Suppose you have this string variable in bash:
filename="House Of Lies 5x02 HDTV XviD [DivxTotaL]"
What can I do to get the 5x02 part?
I've tried with grep with no luck:
echo "$filename" > grep -c '[0-9]x[0-9]{2}'
The option -c which you are passing with grep is wrong
-c Only a count of selected lines is written to standard output.
$ echo $filename | grep -oE '[0-9]{1,2}x[0-9]{1,3}'
5x02
-o Prints only the matching part of the lines.
-E Extended Regex
echo "$filename" | egrep -o '[0-9]x[0-9]{2}'
>file redirects output to a file; |cmd pipes it to another command. -c counts the number of matches, which isn't useful here; -o outputs the matching string(s). To be able to use {2} you need to enable extended regexes, which egrep does.
I run an xargs command invoking bash shell with multiple commands. I am unable to figure out how to print two columns with different delimiters.
The command is ran is below
cd /etc/yp
cat "$userlist" | xargs -I {} bash -c "echo -e 'For user {} \n'
grep -w {} auto_*home|sed 's/:/ /' | awk '{print \$1'\t'\$NF}'
grep -w {} passwd group netgroup |cut -f1 -d ':'|sort|uniq;echo -e '\n'"
the output I get is
For user xyz
auto_homeabc.jkl.com:/rtw2kop/xyz
group
netgroup
passwd
I need a tab after the auto_home(since it is a filename) like in
auto_home abc.jkl.com:/rtw2kop/xyz
The entry from auto_home file is below
xyz -rw,intr,hard,rsize=32768,wsize=32768 abc.jkl.com:/rtw2kop/xyz
How do I awk for the first field(auto_home) and the last field abc.jkl.com:/rtw2kop/xyz? As I have put a pipe from grep command to awk.'\t' isnt working in the above awk command.
If I understand what you are attempting correctly, then I suggest this approach:
while read user; do
echo "For user $user"
awk -v user="$user" '$1 == user { print FILENAME "\t" $NF }' auto_home
awk -F: -v user="$user" '$1 == user { print FILENAME; exit }' passwd group netgroup | sort -u
done < "$userlist"
The basic trick is the read loop, which will read a line into the variable $user from the file named in $userlist; after that, it's all straightforward awk.
I took the liberty of changing the selection criteria slightly; it looked as though you wanted to select for usernames, not strings anywhere in the line. This way, only lines will be selected in which the first token is equal to the currently inspected user, and lines in which other tokens are equal to the username but not the first are discarded. I believe this to be what you want; if it is not, please comment and we can work it out.
In the 1st awk command, double-escape the \t to \\t. (You may also need to double-escape the \n.)
I am using GNU bash, version 4.2.20(1)-release (x86_64-pc-linux-gnu). I have a music file list I dumped into a variable: $pltemp.
Example:
/Music/New/2010s/2011;Ziggy Marley;Reggae In My Head
I wish to grep the 3rd field above, in the Master-Music-List.txt, then continue another grep for the 2nd field. If both matched, print else echo "Not Matched".
So the above will search for the Song Title (Reggae In My Head), then will make sure it has the artist "Shaggy" on the same line, for a success.
So far, success for a non-variable grep;
$ grep -i -w -E 'shaggy.*angel' Master-Music-MM-Playlist.m3u
$ if ! grep Shaggy Master-Music-MM-Playlist.m3u ; then echo "Not Found"; fi
$ grep -i -w Angel Master-Music-MM-Playlist.m3u | grep -i -w shaggy
I'm not sure how to best construct the 'entire' list to process.
I want to do this on a single line.
I used this to dump the list into the variable $pltemp...
Original: \Music\New\2010s\2011\Ziggy Marley - Reggae In My Head.mp3
$ pltemp="$(cat Reggae.m3u | sed -e 's/\(.*\)\\/\1;/' -e 's/\(.*\)\ -\ /\1;/' -e 's/\\/\//g' -e 's/\\/\//g' -e 's/.mp3//')"
If you realy want to "grep this, then grep that", you need something more complex than grep by itself. How about awk?
awk -F';' '$3~/title/ && $2~/artist/ {print;n=1;exit;} END {if(n=0)print "Not matched";}'
If you want to make this search accessible as a script, the same thing simply changes form. For example:
#!/bin/sh
awk -F';' -vartist="$1" -vtitle="$2" '$3~title && $2~artist {print;n=1;exit;} END {if(n=0)print "Not matched";}'
Write this to a file, make it executable, and pipe stuff to it, with the artist substring/regex you're looking for as the first command line option, and the title substring/regex as the second.
On the other hand, what you're looking for might just be a slightly more complex regular expression. Let's wrap it in bash for you:
if ! echo "$pltemp" | egrep '^[^;]+;[^;]*artist[^;]*;.*title'; then
echo "Not matched"
fi
You can compress this to a single line if you like. Or make it a stand-along shell script, or make it a function in your .bashrc file.
awk -F ';' -v title="$title" -v artist="$artist" '$3 ~ title && $2 ~ artist'
Well, none of the above worked, so I came up with this...
for i in *.m3u; do
cat "$i" | sed 's/.*\\//' | while read z; do
grep --color=never -i -w -m 1 "$z" Master-Music-Playlist.m3u \
| echo "#NotFound;"$z" "
done > "$i"-MM-Final.txt;
done
Each line is read (\Music\Lady Gaga - Paparazzi.mp3), the path is stripped, the song is searched in the Master Music List, if not found, it echos "Not Found", saved into a new playlist.
Works {Solved}
Thanks anyway.