Use pmap under linux and ldd to see what process calls lib

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More comprehensive writing installation scripts or other time we would like to know which one is often called lib, we can use pmap method, showing the lib, of course, you can use ldd to see. Then take a look ldd command pmap and under linux. pmap command to use: pmap pid process follows a call to see what lib nginx

# pmap 2492
 2492: nginx: master process /usr/local/nginx-1.4.1/sbin/nginx
 0000000000400000 8408K r-x-- /usr/local/nginx-1.4.1/sbin/nginx
 0000000000e35000 332K rw--- /usr/local/nginx-1.4.1/sbin/nginx
 0000000000e88000 632K rw--- [ anon ]
 0000000001643000 1356K rw--- [ anon ]
 00000032df200000 176K r-x-- /lib64/libpcre.so.0.0.1
 00000032df22c000 2044K ----- /lib64/libpcre.so.0.0.1
 00000032df42b000 4K rw--- /lib64/libpcre.so.0.0.1
 000000341b400000 340K r-x-- /usr/lib64/libssl.so.1.0.0
 000000341b455000 2048K ----- /usr/lib64/libssl.so.1.0.0
 000000341b655000 12K r---- /usr/lib64/libssl.so.1.0.0
 000000341b658000 20K rw--- /usr/lib64/libssl.so.1.0.0
 000000341b800000 12K r-x-- /lib64/libcom_err.so.2.1
 000000341b803000 2044K ----- /lib64/libcom_err.so.2.1
 000000341ba02000 4K r---- /lib64/libcom_err.so.2.1
 000000341ba03000 4K rw--- /lib64/libcom_err.so.2.1
 000000341bc00000 260K r-x-- /lib64/libgssapi_krb5.so.2.2
 000000341bc41000 2048K ----- /lib64/libgssapi_krb5.so.2.2
 000000341be41000 4K r---- /lib64/libgssapi_krb5.so.2.2
 000000341be42000 8K rw--- /lib64/libgssapi_krb5.so.2.2
 000000341c000000 876K r-x-- /lib64/libkrb5.so.3.3
 000000341c0db000 2044K ----- /lib64/libkrb5.so.3.3
 000000341c2da000 40K r---- /lib64/libkrb5.so.3.3
 000000341c2e4000 8K rw--- /lib64/libkrb5.so.3.3
 000000341cc00000 88K r-x-- /lib64/libgcc_s-4.4.7-20120601.so.1
 000000341cc16000 2044K ----- /lib64/libgcc_s-4.4.7-20120601.so.1
 000000341ce15000 4K rw--- /lib64/libgcc_s-4.4.7-20120601.so.1
 000000353aa00000 68K r-x-- /usr/lib64/libXpm.so.4.11.0
 000000353aa11000 2044K ----- /usr/lib64/libXpm.so.4.11.0
 000000353ac10000 4K rw--- /usr/lib64/libXpm.so.4.11.0
 000000358f800000 128K r-x-- /lib64/ld-2.12.so
 000000358fa1f000 4K r---- /lib64/ld-2.12.so
 000000358fa20000 4K rw--- /lib64/ld-2.12.so
 000000358fa21000 4K rw--- [ anon ]
 000000358fc00000 1576K r-x-- /lib64/libc-2.12.so
 000000358fd8a000 2044K ----- /lib64/libc-2.12.so
 000000358ff89000 16K r---- /lib64/libc-2.12.so
 000000358ff8d000 4K rw--- /lib64/libc-2.12.so
 000000358ff8e000 20K rw--- [ anon ]
 0000003590000000 8K r-x-- /lib64/libdl-2.12.so
 0000003590002000 2048K ----- /lib64/libdl-2.12.so
 0000003590202000 4K r---- /lib64/libdl-2.12.so
 0000003590203000 4K rw--- /lib64/libdl-2.12.so
 0000003590400000 92K r-x-- /lib64/libpthread-2.12.so
 0000003590417000 2048K ----- /lib64/libpthread-2.12.so
 0000003590617000 4K r---- /lib64/libpthread-2.12.so
 0000003590618000 4K rw--- /lib64/libpthread-2.12.so
 0000003590619000 16K rw--- [ anon ]
 0000003590c00000 84K r-x-- /lib64/libz.so.1.2.3
 0000003590c15000 2044K ----- /lib64/libz.so.1.2.3
 0000003590e14000 4K r---- /lib64/libz.so.1.2.3
 0000003590e15000 4K rw--- /lib64/libz.so.1.2.3
 0000003591000000 116K r-x-- /lib64/libselinux.so.1
 000000359101d000 2044K ----- /lib64/libselinux.so.1
 000000359121c000 4K r---- /lib64/libselinux.so.1
 000000359121d000 4K rw--- /lib64/libselinux.so.1
 000000359121e000 4K rw--- [ anon ]
 0000003591400000 28K r-x-- /lib64/librt-2.12.so
 0000003591407000 2044K ----- /lib64/librt-2.12.so
 0000003591606000 4K r---- /lib64/librt-2.12.so
 0000003591607000 4K rw--- /lib64/librt-2.12.so
 0000003591c00000 88K r-x-- /lib64/libresolv-2.12.so
 0000003591c16000 2048K ----- /lib64/libresolv-2.12.so
 0000003591e16000 4K r---- /lib64/libresolv-2.12.so
 0000003591e17000 4K rw--- /lib64/libresolv-2.12.so
 0000003591e18000 8K rw--- [ anon ]
 0000003592000000 28K r-x-- /lib64/libcrypt-2.12.so
 0000003592007000 2048K ----- /lib64/libcrypt-2.12.so
 0000003592207000 4K r---- /lib64/libcrypt-2.12.so
 0000003592208000 4K rw--- /lib64/libcrypt-2.12.so
 0000003592209000 184K rw--- [ anon ]
 0000003592400000 372K r-x-- /lib64/libfreebl3.so
 000000359245d000 2044K ----- /lib64/libfreebl3.so
 000000359265c000 4K r---- /lib64/libfreebl3.so
 000000359265d000 4K rw--- /lib64/libfreebl3.so
 000000359265e000 16K rw--- [ anon ]
 0000003593000000 164K r-x-- /lib64/libk5crypto.so.3.1
 0000003593029000 2048K ----- /lib64/libk5crypto.so.3.1
 0000003593229000 4K r---- /lib64/libk5crypto.so.3.1
 000000359322a000 4K rw--- /lib64/libk5crypto.so.3.1
 000000359322b000 4K rw--- [ anon ]
 0000003593800000 1488K r-x-- /usr/lib64/libcrypto.so.1.0.0
 0000003593974000 2044K ----- /usr/lib64/libcrypto.so.1.0.0
 0000003593b73000 100K r---- /usr/lib64/libcrypto.so.1.0.0
 0000003593b8c000 40K rw--- /usr/lib64/libcrypto.so.1.0.0
 0000003593b96000 16K rw--- [ anon ]
 0000003594c00000 8K r-x-- /lib64/libkeyutils.so.1.3
 0000003594c02000 2044K ----- /lib64/libkeyutils.so.1.3
 0000003594e01000 4K r---- /lib64/libkeyutils.so.1.3
 0000003594e02000 4K rw--- /lib64/libkeyutils.so.1.3
 0000003595400000 40K r-x-- /lib64/libkrb5support.so.0.1
 000000359540a000 2044K ----- /lib64/libkrb5support.so.0.1
 0000003595609000 4K r---- /lib64/libkrb5support.so.0.1
 000000359560a000 4K rw--- /lib64/libkrb5support.so.0.1
 0000003762400000 524K r-x-- /lib64/libm-2.12.so
 0000003762483000 2044K ----- /lib64/libm-2.12.so
 0000003762682000 4K r---- /lib64/libm-2.12.so
 0000003762683000 4K rw--- /lib64/libm-2.12.so
 0000003763400000 608K r-x-- /usr/lib64/libfreetype.so.6.3.22
 0000003763498000 2044K ----- /usr/lib64/libfreetype.so.6.3.22
 0000003763697000 24K rw--- /usr/lib64/libfreetype.so.6.3.22
 0000003763c00000 208K r-x-- /usr/lib64/libfontconfig.so.1.4.4
 0000003763c34000 2048K ----- /usr/lib64/libfontconfig.so.1.4.4
 0000003763e34000 8K rw--- /usr/lib64/libfontconfig.so.1.4.4
 0000003764800000 148K r-x-- /usr/lib64/libpng12.so.0.49.0
 0000003764825000 2048K ----- /usr/lib64/libpng12.so.0.49.0
 0000003764a25000 4K rw--- /usr/lib64/libpng12.so.0.49.0
 0000003766c00000 252K r-x-- /usr/lib64/libjpeg.so.62.0.0
 0000003766c3f000 2048K ----- /usr/lib64/libjpeg.so.62.0.0
 0000003766e3f000 4K rw--- /usr/lib64/libjpeg.so.62.0.0
 0000003766e40000 64K rw--- [ anon ]
 0000003769200000 928K r-x-- /usr/lib64/libstdc++.so.6.0.13
 00000037692e8000 2048K ----- /usr/lib64/libstdc++.so.6.0.13
 00000037694e8000 28K r---- /usr/lib64/libstdc++.so.6.0.13
 00000037694ef000 8K rw--- /usr/lib64/libstdc++.so.6.0.13
 00000037694f1000 84K rw--- [ anon ]
 00000037cc000000 8K r-x-- /usr/lib64/libXau.so.6.0.0
 00000037cc002000 2048K ----- /usr/lib64/libXau.so.6.0.0
 00000037cc202000 4K rw--- /usr/lib64/libXau.so.6.0.0
 00000037cc400000 116K r-x-- /usr/lib64/libxcb.so.1.1.0
 00000037cc41d000 2048K ----- /usr/lib64/libxcb.so.1.1.0
 00000037cc61d000 4K rw--- /usr/lib64/libxcb.so.1.1.0
 00000037cc800000 1244K r-x-- /usr/lib64/libX11.so.6.3.0
 00000037cc937000 2048K ----- /usr/lib64/libX11.so.6.3.0
 00000037ccb37000 24K rw--- /usr/lib64/libX11.so.6.3.0
 0000003dbfe00000 152K r-x-- /lib64/libexpat.so.1.5.2
 0000003dbfe26000 2044K ----- /lib64/libexpat.so.1.5.2
 0000003dc0025000 12K rw--- /lib64/libexpat.so.1.5.2
 00007f19d07e7000 288K rw-s- /dev/zero (deleted)
 00007f19d082f000 200K rw-s- /dev/zero (deleted)
 00007f19d0861000 48K r-x-- /lib64/libnss_files-2.12.so
 00007f19d086d000 2048K ----- /lib64/libnss_files-2.12.so
 00007f19d0a6d000 4K r---- /lib64/libnss_files-2.12.so
 00007f19d0a6e000 4K rw--- /lib64/libnss_files-2.12.so
 00007f19d0a6f000 52K rw--- [ anon ]
 00007f19d0a7c000 136K r-x-- /usr/lib64/libgd.so.2.0.0
 00007f19d0a9e000 2048K ----- /usr/lib64/libgd.so.2.0.0
 00007f19d0c9e000 132K rw--- /usr/lib64/libgd.so.2.0.0
 00007f19d0cbf000 28K rw--- [ anon ]
 00007f19d0cce000 4K rw-s- /dev/zero (deleted)
 00007f19d0ccf000 4K rw--- [ anon ]
 00007fffb29c2000 132K rw--- [ stack ]
 00007fffb29fe000 8K r-x-- [ anon ]
 ffffffffff600000 4K r-x-- [ anon ]
 total 88388K

Very detailed in detail, let's look at the command ldd ldd command to use: ldd program commands for example, to see what needs to nginx start lib use, as follows:

# ldd /usr/local/nginx-1.4.1/sbin/nginx
 linux-vdso.so.1 => (0x00007fff41cf0000)
 libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003590400000)
 libcrypt.so.1 => /lib64/libcrypt.so.1 (0x0000003592000000)
 libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003769200000)
 librt.so.1 => /lib64/librt.so.1 (0x0000003591400000)
 libm.so.6 => /lib64/libm.so.6 (0x0000003762400000)
 libpcre.so.0 => /lib64/libpcre.so.0 (0x00000032df200000)
 libssl.so.10 => /usr/lib64/libssl.so.10 (0x000000341b400000)
 libcrypto.so.10 => /usr/lib64/libcrypto.so.10 (0x0000003593800000)
 libdl.so.2 => /lib64/libdl.so.2 (0x0000003590000000)
 libz.so.1 => /lib64/libz.so.1 (0x0000003590c00000)
 libgd.so.2 => /usr/lib64/libgd.so.2 (0x00007f6d99201000)
 libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x000000341cc00000)
 libc.so.6 => /lib64/libc.so.6 (0x000000358fc00000)
 /lib64/ld-linux-x86-64.so.2 (0x000000358f800000)
 libfreebl3.so => /lib64/libfreebl3.so (0x0000003592400000)
 libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x000000341bc00000)
 libkrb5.so.3 => /lib64/libkrb5.so.3 (0x000000341c000000)
 libcom_err.so.2 => /lib64/libcom_err.so.2 (0x000000341b800000)
 libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x0000003593000000)
 libXpm.so.4 => /usr/lib64/libXpm.so.4 (0x000000353aa00000)
 libX11.so.6 => /usr/lib64/libX11.so.6 (0x00000037cc800000)
 libjpeg.so.62 => /usr/lib64/libjpeg.so.62 (0x0000003766c00000)
 libfontconfig.so.1 => /usr/lib64/libfontconfig.so.1 (0x0000003763c00000)
 libfreetype.so.6 => /usr/lib64/libfreetype.so.6 (0x0000003763400000)
 libpng12.so.0 => /usr/lib64/libpng12.so.0 (0x0000003764800000)
 libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x0000003595400000)
 libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x0000003594c00000)
 libresolv.so.2 => /lib64/libresolv.so.2 (0x0000003591c00000)
 libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x00000037cc400000)
 libexpat.so.1 => /lib64/libexpat.so.1 (0x0000003dbfe00000)
 libselinux.so.1 => /lib64/libselinux.so.1 (0x0000003591000000)
 libXau.so.6 => /usr/lib64/libXau.so.6 (0x00000037cc000000)

lib ldd will call to his name and absolute path to the display out to intuitive than pmap. In linux, whether you use ldd are still pmap can see the path to the calling program. If you look at a species already running program but do not know the program path, use pmap more efficient, can be used for other ldd, kind of work, the most used or reproduced, please ldd famous source:. Http: //www.ttlsa. com / html / 3224.html

Reproduced in: https: //my.oschina.net/766/blog/211278