i'm setting a curl to a variable, and then use in other curl. However seems like the curl inside the variable doesn't run, any guess? works on the terminal tho.
RUN content=$(curl -u asd:asd http://zzz:123/aa/aa.aaa?cmd=ls | grep -B1 -E '<bbb>[4-7]\d{8,}' | grep yyy | tail -n 1 | sed -n -e 's/.*<xxx>\(.*\)<\/xxx>.*/\1/p') && curl -u asd:asd http://zzz:123/$content
any guess?
Related
I've written a script to backup my docker mysql containers:
export $(grep -v '^#' .env | xargs -d '\n')
filename=$(date +'%Y%m%d_%H%M%S')
docker-compose exec mysql bash -c "mysqldump --user=$MYSQL_USERNAME --password='$MYSQL_PASSWORD' --ignore-table=$MYSQL_DATABASE.forums_readData_forums_c --ignore-table=$MYSQL_DATABASE.forums_readData_newPosts $MYSQL_DATABASE | gzip > /tmp/$filename.gz"
mysql_container=$(docker ps | grep -E 'mysql' | awk '{ print $1 }')
docker cp $mysql_container:/tmp/$filename.gz $BACKUP_DIR/mysql/
docker-compose exec mysql rm /tmp/$filename.gz
sudo find $BACKUP_DIR/mysql/* -mtime +30 -exec rm {} \;
But when I add it to the crontab, I get the error the input device is not a TTY. That's coming from the docker-compose exec command, except there's no -it flag? When I run this script directly from the shell ./backup.sh, it works fine.
Consider this input file:
bam/pfg413T.GRCh38DH.target.bai
bam/pfg413T.GRCh38DH.target.bam
bam/pfg413T.GRCh38DH.target.bam
bam/pfg416G.GRCh38DH.target.bai
bam/pfg416G.GRCh38DH.target.bam
How can I combine the following multiple grep -E into one grep -E pipe ?
readlink -f exomesinglesample_out/bam/pfg* | grep -E 'pfg[0-9]*G' | grep -E 'bam$'
For example, suppose I have a container which needs the NET_ADMIN capability (keepalived as a container for example).
How can I check, when the container is run, that the capability is actually provided, so that I can add a log / throw an error?
You can commands to check the capabilities
$ capsh --print | grep "Current:" | cut -d' ' -f3 | grep -q cap_net_admin
$ echo $?
0
$ capsh --print | grep "Current:" | cut -d' ' -f3 | grep -q cap_net_admins
$ echo $?
1
Below command shows all available capabilities for a container
$ capsh --print | grep "Current:" | cut -d' ' -f3
cap_chown,cap_dac_override,cap_fowner,cap_fsetid,cap_kill,cap_setgid,cap_setuid,cap_setpcap,cap_net_bind_service,cap_net_admin,cap_net_raw,cap_sys_chroot,cap_mknod,cap_audit_write,cap_setfcap+eip
I've been trying to execute bash on running docker container which has specific name as follows. --(1)
docker ps | grep somename | awk '{print $1 " bash"}' | xargs -I'{}' docker exec -it '{}'
but it didn't work and it shows a message like
"docker exec" requires at least 2 argument(s)
when I tried using command as follows --(2)
docker ps | grep somename | awk '{print $1 " bash"}' | xargs docker exec -it
it shows another error messages like
the input device is not a TTY
But when I tried using $() (sub shell) then it can be accomplished but I cannot understand why it does not work with the two codes (1)(2) above (using xargs)
Could any body explain why those happen?
I really appreciate any help you can provide in advance =)
EDIT 1:
I know how to accomplish my goal in other way like
docker exec -it $(docker ps | grep perf | awk '{print $1 " bash"}' )
But I'm just curious about why those codes are not working =)
First question
"docker exec" requires at least 2 argument(s)
In last pipe command, standard input of xargs is, for example, 42a9903486f2 bash. And you used xargs with -I (replace string) option.
So, docker recognizes that 42a9903486f2 bash is a first argument, without 2nd argument.
Below example perhaps is the what you expected.
docker ps | grep somename | awk '{print $1 " bash"}' | xargs bash -c 'docker exec -it $0 $1'
Second question
the input device is not a TTY
xargs excutes command on new child process. So you need to reopen stdin to child process for interactive communication. (MacOS: -o option)
docker ps | grep somename | awk '{print $1 " bash"}' | xargs -o docker exec -it
This worked for me:
sudo docker ps -q | xargs -I'{}' docker exec -t {} du -hs /tmp/
The exec command you run is something like this:
docker exec -it 'a1b2c3d4 bash'
And that is only one argument, not two. You need to remove the quotes around the argument to docker exec.
... | xargs -I'{}' docker exec -it {}
Then you will exec properly with two arguments.
docker exec -it a1b2c3d4 bash
------ ---
first arg ^ ^ second arg
The following command does not correctly capture the 16714 from 16714 ssh -f -N -T -R3300:localhost:22
egrep -o '^[^ ]+(?= .*[R]3300:localhost:22)'
(However swapping to grep does if you use the -P flag. I was expecting egrep to be able to handle this)
grep -P forces grep to use the Perl regexp engine.
egrep is the same as grep -E and it forces grep to use the ERE (extended regular expression) engine, that does not support lookahead.
You can find a quick reference of the differences between Perl and ERE (and others) here : http://www.greenend.org.uk/rjk/tech/regexp.html
To handle this with POSIX grep, you would use grep to isolate the lines of interest and then use cut to isolate the fields of interest:
$ echo "16714 ssh -f -N -T -R3300:localhost:22" | grep 'R3300:localhost:22' | cut -d' ' -f1
16714
Or, just use awk:
$ echo "16714 ssh -f -N -T -R3300:localhost:22" | awk '/R3300:localhost:22/{print $1}'
16714