Small tricks in shell

!Directories tree view

Set it to your .bashrc and run as tree [DIR].

tree() {
find "${1:-.}" -type d -print 2>/dev/null|awk '!/\.$/ {for (i=1;i<NF;i++){d=length($i);if ( d < 5  && i != 1 )d=5;printf("%"d"s","|")}print "---"$NF}'  FS='/'
}

!Patch selected file only

If you have big patch file with many files there, to patch only one (filename.py in example):

filterdiff -i '*filename.py' patch.diff | patch -pN

and to list all files in patch file use lsdiff or filterdiff --list.

!Test HEAD HTTP with curl

curl -i -X HEAD http://...

!Paging in FAR

view:<command
edit:<command

and to enable scrolling start with far -w.

!Run alternate shell commands

This script run one of available command:

#!/bin/sh

trycmd() {
    a0=$1; shift
    for c in $*; do $c $a0 2>/dev/null && break; done
}

# usage: run one of: pipx|pip0|pip1|pip3|pip with arg: list
trycmd list pipx pip0 pip1 pip3 pip

!Frozen keyboard in PyCharm (Linux)

Bug in forever buggy Java:

ibus restart

!Remove passphrase from SSH key

openssl rsa -in ~/.ssh/id_rsa -out ~/.ssh/id_rsa_new
cp ~/.ssh/id_rsa ~/.ssh/id_rsa.backup
rm ~/.ssh/id_rsa
cp ~/.ssh/id_rsa_new ~/.ssh/id_rsa
chmod 400 ~/.ssh/id_rsa

!Problem with RPC/NFS mount after update CentOS 7

After some digging I finally found that the reason for this is a buggy systemd unit file in RHEL/CentOS 7.

This is a bug in nfs-server.service and he fix is to copy nfs-server.service to /etc/systemd/system and replace all occurrences of "rpcbind.target" with "rpcbind.service".

See this bug for reference: https://bugzilla.redhat.com/show_bug.cgi?id=1171603

!To allow connecting to CentOS

If there is trouble try to stop iptables:

service iptables start iptables flush service iptables stop