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Fast way of finding lines in one file that are not in another?
...(This will have have different output to the diff method if there are duplicates.)
In the event that the files are sufficiently large that storing them both causes a memory problem, you can trade CPU for memory by storing only file1 and deleting matches along the way as file2 is read.
BEGIN { FS="...
Shell script while read line loop stops after the first line
...
Very useful, helped me to run this zsh oneliner: cat hosts | while read host ; do ssh $host do_something ; done
– rat
Jan 2 '18 at 16:43
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How can I make my own base image for Docker?
...he tar file to other docker system if not installed locally and import it
cat centos6-base.tar | docker import - centos6-base
Now you can verify by running it.
docker run -i -t centos6-base cat /etc/redhat-release
The scripts from dotcloud combine first two steps together which make me confus...
Repair all tables in one go
...to print REPAIR SQL statments for all tables inside a database:
select concat('REPAIR TABLE ', table_name, ';') from information_schema.tables
where table_schema='mydatabase';
After that copy all the queries and execute it on mydatabase.
Note: replace mydatabase with desired DB name
...
Get selected option text with JavaScript
... <option value="98">dog</option>
<option value="7122">cat</option>
<option value="142">bird</option>
</select>
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Using SSH keys inside docker container
...tion:
Build command
$ docker build -t example --build-arg ssh_prv_key="$(cat ~/.ssh/id_rsa)" --build-arg ssh_pub_key="$(cat ~/.ssh/id_rsa.pub)" --squash .
Dockerfile
FROM python:3.6-slim
ARG ssh_prv_key
ARG ssh_pub_key
RUN apt-get update && \
apt-get install -y \
git \
...
Returning 'IList' vs 'ICollection' vs 'Collection'
...<T> but not the non-generic ICollection, then calling IEnumerable<Cat>.Count() on a Thing<Cat> would be fast, but calling IEnumerable<Animal>.Count() would be slow (since the extension method would look for, and not find, an implementation of ICollection<Cat>). If the ...
Vim delete blank lines
...e the unique requirement. Someone may still keep one of the empty line. :%!cat -s may be the choice..
– coanor
Nov 21 '12 at 5:04
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How to count lines in a document?
...c -l < /dir/file.txt
3272485
You can also pipe data to wc as well:
$ cat /dir/file.txt | wc -l
3272485
$ curl yahoo.com --silent | wc -l
63
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Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...本的Linux缺省使用Syslog，其配置大致如下所示：
shell> cat /etc/syslog.conf
# Log all kernel messages to the console.
# Logging much else clutters up the screen.
# kern.* /dev/console
# Log anything (except mail) of level info or higher.
# Don't log private authentication ...