Linux Command - sed

Example1.
#/etc/links1 檔案內容
WAN1=rtk0
WAN2=rtk1
LAN1=rtk2
DMZ1=rtk3
DMZ2=rtk4
WAN3=rtk5

# sed -n '3p' /etc/links1
LAN1=rtk2 -->只印出第3行

# sed '5p' /etc/links1
WAN1=rtk0
WAN2=rtk1
LAN1=rtk2
DMZ1=rtk3
DMZ2=rtk4
DMZ2=rtk4 --> 印出第5行
WAN3=rtk5

./Orig file
/usr/home/vincent/EP/target/vendors/D-Link/DFL-1500/www/help/help_files/ad_bm.html
/usr/home/vincent/EP/target/vendors/D-Link/DFL-1500/www/help/help_files/ad_bm_action.html

// 經過執行sed 之後
sed 's/EP\/target\/vendors\/D-Link\/DFL-1500\/www\/help/Help\/Current/g' ./Orig > ./Comp

./Comp file
/usr/home/vincent/Help/Current/help_files/ad_bm.html
/usr/home/vincent/Help/Current/help_files/ad_bm_action.html


研究如何將 "所有的檔案路徑移除，只留下檔案名稱"
Enterprise$ cat x
/abc/123
/abc/der/123
/usr/home/vincent/Help/Current/help_files/ad_bm_action.html

# sed 's/\/([a-zA-Z0-9_]* \ / )*//g' ./x ==> 目前利用這個方法無法work

Enterprise$ sed 's/\/.*\///g' ./x ==> 這個方法是work的，但是太簡單了，需要再想過更好的方法：)
123
123
ad_bm_action.html


.config
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.10
# Tue Nov 29 11:18:26 2005
#
CONFIG_X86=y
CONFIG_MMU=y
CONFIG_UID16=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_IOMAP=y

#
# Code maturity level options
#
CONFIG_EXPERIMENTAL=y
CONFIG_CLEAN_COMPILE=y
CONFIG_BROKEN_ON_SMP=y

# sed -ne 's/^\([A-Z0-9_]*\)=\(.*\)$/#define \1 \2/p' < .config > ./output

output
#define CONFIG_X86 y
#define CONFIG_MMU y
#define CONFIG_UID16 y
#define CONFIG_GENERIC_ISA_DMA y
#define CONFIG_GENERIC_IOMAP y
[略]


The separate token can be either ; or /
# echo --datadir=/var/lib/mysql | sed -e 's;--datadir=;;'
/var/lib/mysql
# echo --datadir=/var/lib/mysql | sed -e 's/--datadir=//'
/var/lib/mysql

We can use sign "#" as the separater, the example is a snapshot of the kamailio Makefile install target
# sed -e "s#/usr/.*lib/kamailio/modules/#/usr/local/lib/kamailio/modules/#g" < etc/kamailio.cfg

# make original file as the filename add suffix name ".old"
sed -i.old -e 's%ftp://ftp.gnu.org/gnu/gcc/releases/gcc-%http://ftp.gnu.org/gnu/gcc/gcc-%' -e 's/gdb //' make/gcc-uclibc-3.3.mk