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Check free disk space for current partition in bash
...will have to do something like:
FREE=`df -k --output=avail "$PWD" | tail -n1` # df -k not df -h
if [[ $FREE -lt 10485760 ]]; then # 10G = 10*1024*1024k
# less than 10GBs free!
fi;
Also for an installer to df -k $INSTALL_TARGET_DIRECTORY might make more sense than df -k "$PWD"...
How to compare two strings in dot separated version format in Bash?
...comparison:
verlte() {
[ "$1" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]
}
verlt() {
[ "$1" = "$2" ] && return 1 || verlte $1 $2
}
verlte 2.5.7 2.5.6 && echo "yes" || echo "no" # no
verlt 2.4.10 2.4.9 && echo "yes" || echo "no" # no
verlt 2.4.8 2.4.10 &&...
Remove the last line from a file in Bash
...name> bs=1 seek=$(echo $(stat --format=%s <filename> ) - $( tail -n1 <filename> | wc -c) | bc )
In words: Find out the length of the file you want to end up with (length of file minus length of length of its last line, using bc) and, set that position to be the end of the file (by d...
Bash empty array expansion with `set -u`
... 4.4 (available in Debian stretch, for example).
$ bash --version | head -n1
bash --version | head -n1
GNU bash, version 4.4.0(1)-release (x86_64-pc-linux-gnu)
Now empty arrays expansion does not emits warning
$ set -u
$ arr=()
$ echo "${arr[@]}"
$ # everything is fine
...
LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
...ou change it to this, it will compile however, join T2 in db.tbl2 on new { N1 = T1.firstName, N2 = T1.secondName } equals new { N1 = T2.colFirst, N2 = T2.colSecond }
– user2023861
Oct 3 '13 at 13:56
...
Git: “Not currently on any branch.” Is there an easy way to get back on a branch, while keeping the
...ou have committed and have not changed anything since:
git log --oneline -n1 # this will give you the SHA
git checkout some-branch
git merge ${commit-sha}
If you have committed and then done extra work:
git stash
git log --oneline -n1 # this will give you the SHA
git checkout some-branch
git mer...
VC菜单命令详解(文件打开、保存与关闭) - C/C++ - 清泛网 - 专注C/C++及内核技术
VC菜单命令详解(文件打开、保存与关闭)第一部分：五个命令ID： 处理函数ID_FILE_NEW CWinApp::OnFileNewID_FILE_OPEN CWinApp::OnFileOpenID_FILE_SAVE CDocument::OnFileSav...第一部分：
五个命令ID： 处理函数
ID_FILE_NEW CWinApp::OnFileNew
ID_FILE_OPEN C...
How to get the first line of a file in a bash script?
...
Yes, head -n1 will be faster (smaller binary to load) and read will be fastest (no binary to load, that's a builtin). I especially like grep -m1 --color . when I'm just printing the first line because it'll color the line too, making i...
How do you append to an already existing string?
... answered Sep 16 at 0:20
n1ce-0nen1ce-0ne
111 bronze badge
...
Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...pd_client_recipient_rate_limit=10
rcpt to的频率控制,也就是说TO了多少个人.
smtpd_client_event_limit_exceptions = ${smtpd_client_connection_limit_exceptions:$mynetworks}
指不做频率控制检测的网络,默认是mynetworks.
posftfix的性能控制
之所以对postfix的性能...